ChangeLog

Zorba - The XQuery Processor

version 3.1

New Features:
  * Added support for query profiling.
  * The json-xml module now supports the "object form" of JsonML.
  * Fixed bugs in the json-xml module.
  * Added public introspection API for external variable annotations.
  * Added non deterministic functions to the JDBC module.
  * Added introspection API for external variable annotations.
  * setVariable() now supports casting sequence elements.
  * zorba command now supports converting multiple values for the same variable into a sequence, e.g.: zorba -e x:=1 -e x:=2 -q 'declare variable $x as xs:integer+ external; $x'
  * The function caching mechanism of Zorba has been completely revamped. New annotations have been introduced for function caching.
    - `%an:nondeterministic`: Declares that the function is non-deterministic. Several calls with the same paramaters may
      return different results. The optimizer is not allowed to cache anything.
    - `%an:deterministic` (default): Declares that the function is deterministic and that several calls with the same paramaters always
      return the same results in the same snapshot, except that newly constructed nodes will have a different identity on each
      call. This is the default behavior from the W3C specifications. The optimizer is allowed to cache function results.
    - `%an:strictlydeterministic`: Declares and enforces that a function is deterministic. Several calls with the same paramaters always
      return the exact same results (also same identity) within a snapshot. The optimizer guarantees this by caching within a snapshot.
    - For a function that only has atomics in its signature, `%an:strictlydeterministic` and `%an:deterministic` are semantically
      equivalent. These functions are by default automatically cached by the optimizer.
    - `%an:cache` (use with care): forces caching across snapshots.
    - `%an:exclude-from-cache-key(n)` specifies that a function argument has to be ignored when computing the cache key.
    - `%an:compare-with-deep-equal(n)` specifies that a function argument has to be compared with deep-equal semantics.
  * New sleep module.
  * Substantial improvements to the http client module.
  * Added JSON Data Manager to expose JSON parsing through the C++ api.
  * Iterator tree printing as XML or JSON.
  * New FTP client.
  * New JSound validator.
  
Optimizations:
  * Improved JSON serialization performance.
  * Improvements in the lexer and parser.

Bug Fixes/Other Changes:
  * Fixed permission of files in the archive (better compatibility with archive extractors (exp. mac).
  * Fixed CSV parser bugs.
  * Fixed transform iterator.
  * Fixed many to many equality.
  * Fixed time comparison.
  * Fixed internal snapshot when using eval.
  * Fixed ref-counting assertions.
  * Fixed debug mode compilation and behaviour.
  * Fixed libxml error handling.
  * Fixed pattern validation.
  * Fixed castable implementation.
  * Fixed null validation in jsound.
  * Fixed function item partial application.
  * Fixed -DZORBA_NO_FULL_TEXT=ON -DZORBA_NO_XMLSCHEMA=ON build flags.
  * Fixed external function and udf profiling.
  * Fixed function cache hashing.
  * Fixed references in query plans.
  * Fixed db:edit and fn:parse-xml segfaults.
  * Fixed simple type cast.
  
version 3.0

New Naming:
  * All modules, annotations, options, collations, pragmas, and other
    namespace URIs changed from http://www.zorba-xquery.com/
    to http://zorba.io/ .

New Features:
  * The grouping variable in a group by clause is now optional.
  * JSONiq extension: New syntax for JSONiq array lookup: expr1[[expr2]].
  * JSONiq extension: jn:trim() and libjn:descendant-arrays().
  * JSONiq extension: Object/array navigation allows item()* as the type of the
    input sequence (doing implicit iteration over the input sequence and skipping
    items that are not objects/arrays).
  * JSONiq extension: Several of the jsoniq functions now allow item()* as the
    type of the input sequence (doing implicit iteration over the input sequence
    and skipping or simply propagating items that are not objects/arrays).
  * JSONiq extension: implicit iteration is also done for jsoniq delete, renames,
    and value replacements.
  * JSONiq extension: EBV on jsoniq items now returns true (instead of raising
    an error).
  * JSONiq extension: jn:analyze-string and jn:serializeFixed (#1192246).
  * New CSV-to-JSON converter module (#1189840).
  * Support XQuery 3.0 item-separator serialization parameter (#1217140).
  * Beta implementation of the JSound schema language (module http://jsound.io/modules/validate)

Optimizations:
  * Implemented hoisting optimization for general FLWOR.
  * Implemented flwor-merge optimization for general FLWOR.
  * Implemented document-ordering elimination for general FLWOR.
  * Applied count optimization to the return clause of general FLWORs.
  * Optimized implementation of fn:deep-equal.
  * No need to apply document ordering on the domain expression of a FOR clause
    if the FOR clause is followed by an orderby or groupby clause.
  * Replaced use of create_value_type() in runtime with getTypeCode().
  * Optimized switch expression.
  * Optimized implementation of function caching and removed the restriction
    on the return type.
  * No node ordering/distinct required for self axis.
  * More aggressive elimination of unused LET variables.
  * Improved performance of castable as expression (#1194720).

Bug Fixes/Other Changes:
  * Fixed bug #1117952 (Improve XML error output format).
  * Fixed bug #1188084 (fn-replace-42 failing).
  * Fixed bug #1189636 (transcoding hexBinary streambuf).
  * Fixed bug #1162631 (format-integer 'w' format of negative numbers).
  * Fixed bug #942171 (file module to allow for arbitrary encodings).
  * Fixed bug #1192285 (Have JSON token know number subtype).
  * Fixed bug #1210628 (file:last-modified returns wrong month).
  * Fixed bug #1190261 (relative paths bug in file module).
  * Fixed bug #1189798 (Update core module "errors").
  * Fixed bug #1187537 (Eliminate (or at least reduce) use of MAX_PATH).
  * Fixed bug #1058398 (set-based sequence operations).
  * Fixed bug #1180220 (Consolidate redundant path/file public APIs).
  * Fixed bug #1158052 (createBase64Binary() API too subtle).
  * Fixed bug #1103115 (Timezone units as hours are wrong).
  * Fixed bug #1188280 (casting xs:id to xs:ncname).
  * Fixed bug #1188100 (regex issues with 'q' flag in fn:tokenize).
  * Fixed invalid memory access error occuring during sequence type matching
    for user-defined types.
  * Fixed bug #1200090 (Convert json-xml module to use JSONiq items).
  * Fixed bug #938574 (changed the names and semantics of the NsScoping enum).
  * Fixed bug #1190710 (fn-format-date failures).
  * Fixed bug #1190407 (wrong rewrite of if-then-else return clause in case
    of general flwor).
  * Fixed bug #1188281 (casting to xs:anySimpleType not allowed).
  * Fixed bug #1189792 (Update core module "sctx").
  * Fixed bug #1188095 (do correct normalization for fn:string-length())).
  * Fixed bug #1189996 (Relocate some public API headers to util).
  * Fixed bug #1189790 (Update core module "full-text").
  * Fixed bug in hoisting through try-catch expr.
  * Fixed bug in casting to xs:NCName.
  * Replaced Base64 C++ API with a better one.
  * Replaced HexBinary C++ API with a better one.
  * Check that the namespace URI used in default namespace declaration is valid
  * Fixed bug in error conditions for computed PI constructor.
  * Fixed implementation of fn:deep-equal according to latest W3C spec.
  * Must apply document ordering on the domain expression of a FOR clause, if
    the FOR clause is followed by a sequential clause.
  * Selector value in object/array navigation is always cast to
    string/integer.
  * The function jn:is-null() has been removed.
  * Removed from libjn module the functions that existed in the jn module as well.
  * Renamed xqxq module to zorba-query module (zq module).

version 2.9

New Features:
  * A new common-language mode has been added to help write code that is 
    compatible with both Zorba's extended XQuery and JSONiq languages. It will 
    raise warnings for code that is not conformant to the common subset.
  * Typeswitch expression extended to allow union of types in each case clause,
    as specified by XQuery v3.0
  * In C++ API, added optional XML formatting of exceptions.
  * Bind zerr:line-number-end and zerr:column-number-end variables in the body
    of a catch clause.
  * New C++ and XQuery function (see module http://www.zorba-xquery.com/modules/item)
    to estimate the size an item allocates in memory.
  * Extended sequence types to include unions, as specified by XQuery v3.0
  * Added XQuery::parse(std::istream& aQuery, ModuleInfo_t& aResult) function.
  * In store API, added ability to specify a stream's originating URI (file)
    for streamable strings and base64Binary.
  * Added millis-to-dateTime() function in datetime module.
  * Added setCalendar(), getCalendar(), setLocale(), and getLocale() to
    DynamicContext class in C++ API.
  * fn:trace outputs "empty-sequence()" if the input is the empty-sequence.
  * Allow multiple default function namespaces.
  * Implemented computed namespace constructors and namespace-node() kindTest.
  * $array() => jn:members($array), $object() => jn:keys($object)
  * Added xqxq:variable-value function.
  * Added canonicalize function to modules/xml.
  * Added support for xs:dateTimeStamp type from XMLSchema 1.1, bug #924754.
  * Implemented resolution of module-import cycles according to the W3C XQuery 3.0 spec.
  * Added uri:parse() and uri:serialize() functions to URI module for
    parsing URI into components and forming URIs from components.
  * Added support for the standardized require-feature and prohibit-feature
    options.
  * Implemented higher order functions (function items, partial and dynamic
    function invocation, and related fn library functions).

Optimizations:
  * Extended optimization rules for subsequence function (pushing $startingLoc
    parameter into collection skip if $sourceSeq parameter is from a
    collection).
  * Introduced generic framework for optimizing fn:count() during runtime:
    Virtual PlanIterator::count() method provides the base (unoptimized)
    implementation of fn:count(). This base method is redefined by other plan
    iterators who have a way of returning the cardinality of their result
    sequence without actually computing the full result sequence.
  * Optimized fn:index-of function
  * Extented index join  rule to general flwor expressions. 

Bug Fixes/Other Changes:
  * Fixed bug #1176038 (memory error in parser revealed by Bison 2.7)
  * Fixed bug #1102997 (Swapping referenced nodes)
  * Fixed bug #1169908 (Zorba hangs with invalid utf-8 input)
  * Fixed bug #1111487 (Swapping nodes that are in collections)
  * Fixed bug #1083006 (subsequence: large input values)
  * Fixed bug #1123836 (overflows in date/time casts now return FODT0001 and
    in durations return FODT0002)
  * Fixed bug #1147518 (fn:round-half-to-even (at least 11 failures))
  * Fixed bug #1167704 (Implement [w] for ISO calendars for format-date/time functions)
  * Fixed bug #1114228 (unrecognized options in the XQuery namespace now raise an error)
  * Fixed bug #1124273 (xqdoc crash because of annotation literals)
  * Fixed bug #1175752 ("format-date-en152" and "format-dateTime-en152" failing)
  * Fixed bug #1085408 (xs:date(): casting large year values)
  * Fixed bug #867027 (XQST0059 error messages inconsistent)
  * Fixed fn:nilled function
  * Fixed bug concerning nillability during sequence type matching.
  * Fixed bug in handling the type declaration of a FOR variable that allows empty.
  * Fixed bug in casting to normalizedString.
  * Fixed bug #1095889 (Improve error message for xml-parsing error).
  * Fixed bug #1131984 (apparently invalid regex in queries)
  * Fixed bug #1123163 (fn:format-integer failures)
  * Fixed bug in index join rule (no index join if inner clause has positional var).
  * Fixed bug in index join rule (copy var ids after cloning index domain expr).
  * Fixed bug #1131988 (re00732 fails)
  * Fixed bug in handling the type declaration of a window variable.
  * Fixed bug #1131990 (re00737 fails)
  * Fixed bug #1123162 (FOTS: formatting dates and times failures)
  * Added missing wrapper expressions around some variable references.
  * Fixed optimizer bug: elimination of positional variable sometimes caused
    elimination of whole FOR clause.
  * Fixed bug in the throwing of error XQTY0086 during node construction.
  * Fixed bug #1148335 (where-clause expression was not always reset when it should be)
  * Fixed bug #1122396 (Associate origin/destination URI to I/O stream)
  * Fixed bug #1111786 (xml/json parse error location in catch clause).
  * Fixed bug #1153800 (construct hexBinary without encoding the data)
  * Fixed bug #1076402 (bug in CastIterator when target is QName)
  * NaN items are considered equal to each other during grouping
  * Fixed bug #855481 (Too small time types on Windows).
  * Fixed bug #1154984 (windows build crashes if a vector iterator is reused
    after it is used to erase an element of the vector)
  * Fixed bug #1132032 (Certain regexes involving ^ should be legal)
  * Fixed bug #1023168 (Non-single-char-escapes in regex character ranges not
    caught)
  * Throw XQST0048 for groupby clause, as specified by XQuery 3.0.
  * Fixed bug #1064289 (file module cannot delete broken symbolic links)
  * Fixed bug in raising XQTY0086 (copying of namespace-sensitive values during
    node construction).
  * Fixed bug #866874 (regex "range subtraction" not supported for ICU)
  * Fixed bug in computing the static type of an allowing-empty FOR variable.
  * Fixed bug #1099648 and #1088886 (XML parsing failures on Red Hat)
  * Fixed bug #1131985 (\p{IsPrivateUse} in regex may not be working)
  * Fixed bug #1099535  (xml:parse endless loop)
  * Fixed bug in optimizing fn:count over general-index probes
  * Fixed bug #866958  (Parsing error not explicit enough)
  * Fixed bug #1123164 (fn:format-number failures (at least 19))
  * Fixed memory leak in temp sequence
  * Fixed bug in computing the static type of a self-axis path step.
  * Fixed bug #867068: (Incorrect usage of XQDY0027)
  * Fixed bug: jsoniq constructor should not be const-folded
  * Fixed bug #866958 (Parsing error not explicit enough)
  * Fixed bug #1152834 (bug in computing the scripting kind of array and object
    constructor exprs)
  * Fixed bug #1125444 (input group-by exprs were not treated by index-flwor_vars()
    function, leading to erroneous loop hoisting).
  * Raise XQST0046, if needed, from namespace declaration attribute inside
    direct element constructor.
  * Fixed bug #1023362 (xsi:type attribute ignored during validation)
  * Fixed bug #1025564 (Deprecate -f argument to zorbacmd)
  * Fixed bug #1082740 (support for INF and -INF values in fn:subsequence function).
  * Fixed bug #1015468 (wrong result from fn:resolve-uri())


version 2.8

New Features:
  * New external module for interfacing with Couchbase Server.
  * New external module for interfacing with SQLite Database.
  * New external module for interfacing with Oracle NoSQL Database.
  * New external module for interfacing with relational databases via JDBC.
  * New external info-extraction module for querying concepts and entities in
    natural language text.
  * New built-in module to (de)reference XML nodes or JSON objects and
    arrays that are stored in a collection
  * Implemented JSONiq's json-doc() function.
  * http-uri-resolution feature to disable HTTP when resolving URIs.
  * Option to specify that parse-json() strips the top-level array.
  * Extended cast and castable expression to allow any simple target type
    (as specified by XQuery 3.0).
  * The XQXQ (XQuery-for-XQuery) module became part of the Zorba core.
  * The datetime module became part of the Zorba core.
  * In the datetime module, added parse-date(), parse-dateTime(), parse-time(),
    and utc-offset().
  * Includes test driver for W3C XQuery 3.0 Test Suite (aka FOTS).

Optimizations:
  * Various optimizations in the implementation of the optimizer rules.
  * Better computation of the static type for global variables.
  * Optimization of comparison operators when untypedAtomic items are involved.
  * Improved computation of static type for fn:data function.
  * Fixed iteration over the components of a window clause; this improves static
    type computation of expressions referencing window vars.
  * No need to cast xs:untypedAtomic to xs:string in order-by expression.
  * Convert LET variables whose domain sequence has exactly one item to FOR
    vars.

Bug Fixes/Other Changes:
  * Fixed bug #949064  (faulty QName should be printed in the error message)
  * Fixed bug #1072644 (broken parser error location)
  * Fixed bug #868640 (Node lifetime is shorter than expected due to let
    variable inlining)
  * Fixed bugs #1081626 (Segmentation fault in a side-effecting FLWOR),
    #1079488 (streaming segfault)
  * Fixed bug #1062093 (bug in var reference iterators with an associated
    position that is negative)
  * Fixed bug #1073978 (FOTS: option default ns not supported)
  * Fixed bug #1061222 (bad message for errors in index key type declaration)
  * Fixed bug #1065175 (preceding::node()[1] returns wrong results)
  * Fixed bug #1065321 (following:text() doesn't return results in doc order)
  * Fixed bug #1067706 (wrong const folding in mutually recursive udfs)
  * Fixed bug #1021492 (while computing the "sources" of a prolog var, skip any
    var-setting exprs that appear in non-used (and non-optimized) functions).
  * Fixed bug #1070551 (zerr:ZOSE0003 stream read failure)
  * Fixed bug #992304 (Compiling library modules could load data from wrong
    source).
  * Fixed bug #1043294 (XQST0036 not used in XQuery 3.0).
  * Fixed bug in castable expr when the target type is xs:QName.
  * Fixed bug in testing if a sequence type is subtype of node(xs:untyped)
  * Fixed mustCopyInputNodes() method of no-copy, and jsoniq functions.
  * Fixed bugs related to casting to user-defined types.


version 2.7

New Features:
  * XQuery 3.0 simple map operator http://www.w3.org/TR/xquery-30/#id-map-operator
  * Copy function added to the node module
  * Allow prolog variables to be referenced before they are declared (XQuery 3.0 feature)
  * Module http://www.jsoniq.org/modules/function-library with handy JSONiq functions
  * jn:parse-json can parse multiple top-level JSON items
  * New semantics of null for comparison and arithmetics operations
  * xml:parse (fragment parsing) now allows for a DOCTYPE declaration at the
    beginning of the XML document (requested in bug #1016606).
  * Roundtripping of JSON items has been moved from the serializer to encoding functions.
  * Added uuid to public API.
  * Best-effort serialization of atomic values in JSON items.
  * Positional pagination support for index probes
  * Recognize the {http://www.zorba-xquery.com/extensions}no-copy pragma to avoid
    copying nodes before insertion into a collection.
  * Added createUntypedAtomic to API's ItemFactory.
  * new xqDoc feature; reporting collections and indexes
  * new xqDoc function parameter to enable/disable xqDoc generation of certain
    components
  * Adding new external module read-pdf, it converts PDF documents to text or rendered images.

Optimizations:
  * Improved memory management for compiler expressions (no more ref counting)
  * Extended optimization rules (for variable inlining/elimination and positional
    predicate rewrite) to general flwor expressions.
  * Early optimization of positional predicates to subsequence expressions: now
    done at translation time, if possible.
  * For non-mutable global variables, assign a type based on their initializing expr.
  * Use char* instead of zstring as the hashmap key in json objects
  * Removed document-order sorting after the index value probe functions.
  * Optimize positional predicates involving inequality (convert them to subsequence)
  * Optimize positional predicate that is in CNF with other predicates.
  * Optimized runtime group iterator based on latest group-by semantics.
  * Removed two unnecessary steps from optimizer.

Bug Fixes/Other Changes:
  * Fixed bug #1006960 (taking construction mode into account during no-copy rule)
  * Fixed bug #950621 (Removed two-arg version of fn:parse-xml(); use XML module
    function xml:parse() instead)
  * Fixed bug #867227 (Improved error message for missing commas)
  * Fixed memory leak during runtime group-by"
  * Fixed bug #1024033 and #1023170 (segfaults in parse-xml:parse())
  * Fixed bug #898792 (Dynamically computed strings can now be cast to xs:QName)
  * Fixed bug in determining the IsId property of constructed attribute nodes
  * Fixed bug #1034990 (text serialization with jsoniq fails)
  * Fixed bugs #899364 and 899363 (throw XQST0103 in case of non-distinct window
    variables)
  * Fixed bug #923686 (implicitly declare global context size and context position
    variables in main module and provide api function to assign values to these
    variables)
  * Fixed bug #899366 (enforce the type declaration of a window variable)
  * Fixed bug #1034942 (improper variable inlining inside general flwor expr)
  * Fixed bug #1024892 (index declaration references udf declared after the index)
  * Fixed bug #1038410 (Memory leaks in parser, trace iterator, and general index)
  * Fixed bug #1046411 (automatic boxing of multi-item sequence appearing as the
    value of an object pair)
  * Fixed bug #1046410 (automatic conversion to null of empty sequence appearing
    as the value of an object pair)
  * Fixed bug #1039488 (inserting more than one pair at once in a JSON object)
  * Fixed bug #1042840 (QName pool free-list corruption)
  * Fixed bug #866984 (better error message for an eval error)
  * Fixed bug #1047538 (SourceFinder::findLocalNodeSources missing json expressions)
  * Fixed bug #932374 (FOTS fn:matches failing tests)
  * Fixed #1052383 (accessing context item in eval expr)
  * Fixed bug #1046559 (dynamic resolution between function invocation and jsoniq
    navigation)
  * Fixed bug #932884 (HTML and XHTML serialization of empty elements)
  * Fixed bug #1046415 (pair name cast to string)
  * Fixed bug #1045902 (file:last-modified returns current date time)
  * Fixed bug #1043976 (compiler warning in serializer code)
  * Fixed bug #866994 (a better error message when collection iterator not open)
  * Fixed bug #1039254 (allow empty sequence as position value in positional LET
    var iterator)


version 2.6

New Features:
  * Include first-class support for JSON data by implementing the JSONiq spec
  - see http://jsoniq.org/ for more information. This feature is enabled by default.
  * Implemented the new EQName syntax (use Q{namespace}local instead of "namespace":local)
  * New function Item::isSeekable for streamable content (xs:string and xs:base64Binary)
  * Implemented the latest W3C specification for the group by clause (backwards incompatible)
  * New ft:tokenize-nodes() function to full-text module
  * New XQuery 3.0 function fn:parse-xml-fragment#1
  * New ItemFactory function that allows creating dateTime items without timezone
  * Added support for transient maps to the
    http://www.zorba-xquery.com/modules/store/data-structures/unordered-map module.
  * Added support for fragments to fn:path
  * Positional pagination support for collections
  * Pagination by reference support for collections
  * http://www.zorba-xquery.com/modules/archive module for creating,
    reading, and updating various (compressed) archives (e.g. zip, tar.gz,
    or tar.bz2)
  * Incremental maintenance for general indexes
  * New function in the http://www.zorba-xquery.com/modules/store/static/indexes/dml
    module which returns the value of all keys contained in an index

Optimizations:
  * Optimization of comparison operations
  * Tighter hoisting of expressions (also fixes bug #967428)
  * Optimized hash sets used by fn:distinct-values and nodes-distinct
  * Optimized hash function used for nodes (also fixes bug #1010051)
  * Rewrite of plan serializer internals, resulting in big performance improvement
  * Avoid treat expr for checking that the value of a non-external
    global variable conforms to the type declaration of the variable
  * Streaming execution for tumbling windows (also fixes bug #1010051)

Bug Fixes/Other Changes:
  * Fixed bug #1025622 (Incorrect JSON serialization of supplementary plane code points)
  * Fixed bug #1016606 (DOCTYPE in the input of the parse-fragment function)
  * Fixed bug #1002993 (bug during revalidation after update; improper condition
    for calling TypeOps::get_atomic_type_code() from
    SchemaValidatorImpl::isPossibleSimpleContentRevalImpl())
  * Fixed bug #867357 (Improved parser error messages)
  * Fixed bug #1026379 ("q" flag for fn:replace() is ignored)
  * Fixed bug #932314 (non-comparable values must be treated as distinct by
    fn:distinct-values)
  * Fixed bug #1015580 (Add base64_streambuf / replace inefficient base64 code)
  * Fixed bug #1022557 (subsequence function applied on window variable)
  * Fixed bug #9910884 (raise XUST0001 in trycatch with mixed updating and simple clauses)
  * Fixed bug #854506 (ugly type error messages) and partial fix for bug #867008
  * Fixed bug #1008082 (bug in transform expr when a copy var is not used anywhere)
  * Fixed bug #898066 (Stringstream & fn:trace)
  * Fixed numbering of items in fn:trace starts with one
  * Fixed bug #1003023$ (optimizer problems due to common subexpression after
    var folding into if-then-else)
  * Fixed bug #1006166 (disabling 2 functions with the same qname)
  * Fixed bug #960083 (improper error handling of NaN comparisons)
  * Fixed bug #878508 (JsonML serialization not escaping characters)
  * The XML plan serialization format is not supported anymore


version 2.5

New Features:
  * New XQuery 3.0 functions
    - fn:available-environment-variables
    - fn:environment-variables
    - fn:uri-collection
    - fn:unparsed-text
    - fn:unparsed-text-available
    - fn:has-children#0
    - fn:nilled#0
    - fn:path
  * Added base64:decode#2 function which also does transcoding
  * Extended API for Python, Java, PHP and Ruby
  * Added JVM classpath to zorbacmd and to Zorba API
  * Added full-text module
  * Added support for NO_ICU (to not use ICU for unicode processing)
  * Added XQJ support
  * Added CollectionManager and DocumentManager support for XQJ
  * Added new API EntityKind SOME_CONTENT
  * Added new API StreamResource which is able to specify whether a
    stream is seekable or not.
  * Added new functions in the fetch module and the StaticContext to fetch
    resources as binary
  * Added non-core schema-tools module for getting sample XMLSchema from
    XML instances and sample XML instances from XMLSchema.

Optimizations:
  * optimized insertion into a collection (don't copy it if the node was
    created by an element constructor and is not used anywhere else in the query)
  * Fixed performance problem with the findNodeSources function of the no-copy rule

Bug Fixes/Other Changes:
  * Fixed bug #867170 (Variables declared in Prolog are Overwritten inside the query)
  * Fixed bug #1001463 (type not available during computation of function caching)
  * Fixed bug #1002867 (resulting base64 in http-client is wrong)
  * Fixed bugs #905028 (Allow to set base URI to undefined)
  * Fixed bugs #931501 and #866987 (improved error messages for fn:format-number()
  * fn:format-number raises FODF1310 instead of XTDE1310
  * Fixed bug 955170 (Catch clause with URILiteral-based wilcard NameTest)
  * Fixed bug #862971 (no error upon duplicate function declarations)
  * Fixed bug 955135 (err:XQDY0044 not caught by try-catch expressions)
  * Fixed bug #986075 (encountering flwor expr with no clauses)
  * Fixed bug #967864 (var substitution did not update theFreeVars property)
  * Fixed bug #891650 (context size var not always declared within path expr)
  * Fixed bug #948879 (--uri-path doesn't work with fetch:content())
  * Fixed bug in MarkNodeCopyProps rule (static cast to replace_expr without chaing the expr kind first)
  * Fixed bug in window iterator (binding the end vars in the output tuple stream)
  * Fixed bug #866547 (protect index-join rule from general flwor)
  * Fixed bug #867253 (cdml:delete-nodes should only remove root nodes)
  * Fixed bug #967428 (do not hoist index creation outside a try-catch)
  * Fixed bug #872234 (prevent a rewritting to take place in case of sequential expr)
  * Fixed bug #966706 (key uniqueness of index not enforced during incremental refresh)
  * Fixed bug #906494 (default compile with D_FILE_OFFSET_BITS=64)
  * Fixed bug #988412 (date:current-dateTime daylight saving)
  * Fixed bug #912586, #912593 and #912722 (assertion failures with lax validation)
  * Fixed bug #986377 (do not apply any updates on collection if it is to be truncated)
  * Fixed bug #921458 (file:read-text-lines() blocking)
  * Fixed bug #981405 (do not hoist expr containing try-catch variables out of the associated try-catch expression)
  * Fixed bug #996084 (crash in Streamable*Item with file module)
  * Fixed bug #947627 (throw XQST0099 if more than one declarations of context item type in same module)
  * Fixed bug #980526 (no-copy rule bug due to global var being set in "distant" udf)
  * Fixed bug #949910 (has-children may be invoked on all nodes)
  * Fixed Bug #933490 (Error ItemFactoryImpl::createBase64Binary with istream)
  * Fixed bug #867112 (Diagnostic Handler was not working on external APIs)
  * Fixed bug #857842 (Assertion failed with simple content element with comments)
  * Fixed bug #928626 (no setting classpath in xsl-fo module)

version 2.2

New Features:
  * Add --compile-plan (-c) and --execute-plan (-e) options to zorba command line.
  * Add XQuery 3.0 concat operator (http://www.w3.org/TR/xquery-30/#id-string-concat-expr)
  * New URI module providing percent-decoding functions.
  * The core parse-xml module is now able to parse input files in a streaming mode. A number of new options have also been added.
  * LibXml2 version 2.7.0 or higher is now required in order to build Zorba.
  * Added index management function to the C++ api's StaticCollectionManager.
  * Added createDayTimeDuration, createYearMonthDuration, createDocumentNode, createCommentNode, createPiNode to api's ItemFactory.
  * Fixed bug #905050 (setting and getting the context item type via the c++ api).
  * Added split function to the string module that allows for streamable tokenization but doesn't have regular expression
  * Add new XQuery interface for the PHP bindings.
  * Added two API methods StaticContext::getFunctions to introspect the functions of a static context
  * Added API method Item::getNamespaceBindings().
  * Added a transcoding streambuffer to the API which allows transcoding arbitrary encodings
    from and to UTF-8
  * file:read-text is able to handle arbitrary encodings (fixes bug #867159)
  * http:send-request is able to handle arbitrary encodings
  * Added API method StaticContext::getNamespaceBindings() (see bug #905035)
  * New version of the JSON converter module in the core of Zorba (no external dependencies anymore)
  * Added truncate function to the collection modules for efficient deletion of all nodes in a collection.


Optimization:
  * No-copy optimization: avoids copying nodes during node-constructor expressions.
  * Added external function annotations %ann:propagates-input-nodes and
    %ann:must-copy-input-nodes to be used by the no-copy optimization.
  * Caching of results for recursive functions with atomic parameter and return types.
  * Added %ann:cache and %ann:no-cache to enable or disable caching of results of functions with atomic parameter and return types.
  * Types-related optimizations for runtime operators (comparisons, FnBoolean, Or, And,
    Compare, instance-of, cast, castable, treat, promote).
  * More efficient implementation for base64Binary items
  * Preallocate and reuse temp sequence iterator for LetVarITerator
    and CtxVarIterator.
  * Enhanced push-down of positional predicate into LetVarITerator
    and CtxVarIterator.
  * Change the implementation of the free-vars annotation and got rid
    of the annotations map in expressions.

Bug Fixes/Other Changes:
  * Fixed bug 923015 (clone() not implemented for full-text expressions)
  * Fixed bug 917923 (bug in copying outer var values into the eval dynamic context)
  * Fixed bug 867509 (Can not handle largest xs:unsignedLong values)
  * Fixed bug 924063 (sentence is incorrectly incremented when token characters end without sentence terminator)
  * Fixed bug 909126 (bug in cloning of var_expr)
  * Fixed bug 928631 (external builtin function were not executed in the module they
    were declared)
  * Fixed bug in destruction of exit_catcher_expr
  * Fixed bug #867024 (error messages)
  * Fixed bug #957580 (stream read failure in StringToCodepointsIteartor)
  * Fixed bug #911585 (management of variables during eval)
  * Fixed bug #866423 (fn:empty and fn:exists iterators must reset their input in
    case of early-out)
  * Fixed bug #955574 (http-client "hangs" if following a POST request)
  * Fixed bug #945241 (StaticCollectionManager::declaredIndexes() and temporary indexes)
  * Fixed bug #872288 (reset recursive flag during node rename)
  * Fixed bug #905041 (allow for the default element and function namespaces to be
    set multiple times via the c++ api).
  * Fixed bug #907872 (segfault when returning an input ItemSequence from an external function).
  * Fixed bug in codegen: do not create a materialize clause if one exists already
    support.
  * Fixed bug involving positional var and groupby
  * Fixed bug #867266 (do not hoist updating expressions)
  * Fixed bug #867022 (added location and params to some XPTY0004 errors)
  * zerr is not predeclared anymore to be http://www.zorba-xquery.com/errors
  * Fixed bug #917981 (disallow declaring same module twice).
  * Deprecated StaticContext:getNamespaceURIByPrefix()
  * Fixed bug #943788 (streamable string is not seekable)
  * Fixed bug #921624 (slow queries with bogus example.com schema URIs)
  * Fixed bug #918211 (xqueryx fulltext w3c conformance generation)
  * Fixed bug #918157 (Add XQFTTS to validation queue)
  * Fixed bug with unversioned modules with C++ external functions
  * Fixed bug #912579 (validate-in-place on non-root elements)
  * Fixed bug #891209 (validation with xsi:type returns untyped)
  * Fixed bug #952829 (Nondeterministic annotation doesn't seem to be checked)
  * Fixed bug #951772 (Comment node crashes serialization)
  * Fixed bug #945241 (StaticCollectionManager::declaredIndexes() and temporary indexes)


version 2.1

New Features:
  * New node-position module. This module allows to obtain a representation of a node position, which
    can be used to assess structural relationships with other nodes.
  * New node-reference module. References can be obtained for any node, and
       different nodes cannot have the same identifier.
  * Custom Full-text thesaurus using Zorba URI resolver mechanism.
  * Modified C++ API to add isSequential, getExternalVariables,
       isBoundContextItem and isBoundExternalVariable Functions
  * Collection allows to retrieve information about the type
  and the annotations of a static collection.
  * Implemented the probe-index-range-value for general indexes
  * Added ExternalFunctionParameter class to be registered in the DynamicContext
  * New module for compiling and executing XQueries from XQuery (xqxq)
  * External functions are allowed to be updating (i.e. return a pending update list)

Optimization:
  * Optimization for positioned sequence access (e.g. $x[$x[1]] where $x is a
  sequence of integers)
  * Optimization for count(collection()) expressions
  * Optimization of the fn:substring function in the case when its $start and $length arguments
  are integers

Bug Fixes/Other Changes:
  * Fixed bug #3403291 (build for Fedora 15)
  * Fixed bug #3397293 (Incorrect XQueryX error message)
  * Fixed bug #3398637 (Nested element constructors cause loss of namespace bindings)
  * Fixed bug #3401592 (Undo of Create Collection doesn't work)
  * Fixed bug #3404689 (assignment problem in flwor)
  * Fix for bug #3404450 (testdriver_mt problem: caching and validation of docs)
  * Fixed installation bug to not install the .so for test modules
  * Fixed bug #3390410 (Adding a node to a collection causes out of bound in vector)
  * Fixed bug #3406200 (node types were not being moved to new tree during node detach)
  * Fixed bug #3406191 (Namespace bindings lost after update due to bug in node detach)
  * Fixed bug #3290122 (ZDST0003 needs collection name)
  * Fixed bug #3406272 (merging of adjacent text nodes must be done after all
    updates have been applied).
  * Don't raise warnings for unknown annotations.
  * Fixed bug #3409344 (during detach, if the node being detached is the root of
    its tree, it should be detached from the tree as well; otherwise memory
    corruption will occur)
  * Fixed bug # (Should not destroy the parent of a node that is being detached
    before the detach is done).
  * Added const qualifier to StaticContext::getAuditEvent()
  * Fixed bug #3408181 (available-collection() returns undeclared collections)
  * Fixed bug #859465 (Fatal error if a PUL contains two deactivate IC primitives)
  * Fixed bug #859467 (Fatal error if a PUL contains two activate Foreign Key primitives)
  * Fixed bug #859468 (Fatal error if a PUL contains two activate Simple IC primitives)
  * Fixed bug #859522 (Fatal error if a PUL contains two delete document primitives)
  * Fixed bug #859968 (Using put on an attribute produces an invalid XDM instance and may cause segmentation faults)
  * Fixed bug #855314 (should not fold a constant expr that returns an error item)
  * Fixed bug when parsing a document with a base-uri attribute.
  * Fixed bug #863320 (Sentence is incorrectly incremented when token characters end without sentence terminator)
  * Fixed bug #863730 (static delete-node* functions don't raise ZDDY0012)
  * Implemented the probe-index-range-value for general indexes
  * Removed ZSTR0005 and ZSTR0006 error codes
  * Fixed bug #867662 ("nullptr" warning)
  * Fixed bug #868258 (Assertion failure with two delete collection)
  * Fixed bug #871623 and #871629 (assertion failures with insertions in dynamic collections)
  * Fixed bug #867262 (allow reuse of iterator over ExtFuncArgItemSequence)
  * Fixed bug #869024 (segmentation fault with node-reference)
  * Fixed bug #869025 (segmentation fault with node-reference)
  * New node-reference module. References can be obtained for any node, and
      different nodes cannot have the same identifier.
  * Fixed bug #872697  (segmentation fault with validation of NMTOKENS)
  * General index cannot be declared as unique if the type of its key is
    xs:anyAtomicType or xs:untypedAtomic.
  * Added undo for node revalidation
  * Optimization for count(collection()) expressions
  * Fixed bug #872796  (validate-in-place can interfere with other update primitives)
  * Fixed bug #872799 (validate-in-place can set incorrect types)
  * Fixed bug #855715 (Invalid escaped characters in regex not caught)
  * Fixed bug #868325 (fn:analyze-string fails with some recursive subgroups)
  * Fixed bug #872697 (segmentation fault with validation of NMTOKENS)
  * General index cannot be declared as unique if the type of its key is
  xs:anyAtomicType or xs:untypedAtomic.
  * Added undo for node revalidation
  * Optimization for count(collection()) expressions
  * Fixed bug #867133 (SWIG PHP build failure on Mac OSX)
  * Fixed bug #872796 (validate-in-place can interfere with other update primitives)
  * Fixed bug #872799 (validate-in-place can set incorrect types)
  * Fixed bug #872850 (Serialization of Tumbling Window For fails)
  * Fixed bug #855715 (Invalid escaped characters in regex not caught)
  * Fixed bug #862089 (Split binary/xq install directories for modules) by
  splitting "module path" into separate URI and Library paths
  * New node-position module. This module allows to obtain a representation of a node position, which
    can be used to assess structural relationships with other nodes.
  * Fixed bug #872502 (validation of the JSON module xqdoc fails)
  * Fixed bug #897619 (testdriver_mt can not run the XQueryX tests)
  * Fixed bug #867107 (xqdoc dependency to zorba is wrong)
  * Fixed bug #897616 (Fix the generation of the XQFTTS report results for
  W3C)

version 2.0.3
  * Fixed bug #867662 ("nullptr" warning)
  * documentation improvements

version 2.0.2
  * Fixed bug #3401971 (node-by-reference on dynamic collections)
  * documentation improvements
  * installer improvements
  * Fixed bug #3403291 (build for Fedora 15)
  * Don't install the .so for test modules
  * Fix for running ctest on Windows

version 2.0.1

  * Custom Full-text stemming.
  * Custom Full-text tokenization.
  * Fixed scripting bug where apply statement was considered a sequential expr even if the source expr was non-updating and non-sequential.
  * Fixed bug #3394400 (Element replacement, really unexpected result)
  * Fixed bug #3394588 (Unexpected error during pul undo)
  * Fixed bugs #3398511 and #3398552 with "make install"
  * Fixed bug #3398521 for compiling with ZORBA_NO_XMLSCHEMA

version 2.0
  * Zorba 2.0 is a major rewrite of previous versions. It doesn't claim to
    preserve backwards compatibility with any 1.X version.
    Host language API changes have been made to the following components:
    - External functions API
    - XmlDataManager
    - Error reporting
    - Debugger API
    XQuery language and API changes have been made to the following components:
    - XQuery Scripting Extension
    - Function APIs
    - XQuery Data Definition Facility
    - XQuery modules and module versioning
    - Changes to conform with the latest XQuery 3.0
    - Namespaces of annotations, errors, collations.
  * In addition to host language API and XQuery language improvements,
    plenty of bug fixes and optimizations have been made.

version 1.4
  * added a datetime library module with nondeterministic functions
  * new nondeterministic read functions in the http-client module
  * the http-client's send-request function accepts a non-validated request parameter
  * fixed an issue with a wrong static context being used in eval queries (see bug item #2979317)
  * added XQuery 1.1 Switch expressions (only available in 1.1 processing mode)
  * added the fn:parse function from XQuery Functions and Operators 1.1
  * improved error reporting for parser errors
  * improved error reporting for errors regarding sequential expressions
  * bug fixes
    - accept relative URIs in xs:anyURI constructors (#2988209)
    - direct element/attribute construction (#2999765)
    - deep-equal (#2999772)
    - schema-attribute(*) is parsed as a function call instead of a node test (#2993286)
    - handling xml:base attributes during doc loading (#3013096)
    - fixed build with CMake 2.6.0 on Debian Lenny
    - try-catch error if XQuery version < 1.1 (#3005344)
    - W3C test suite bugs CastableAs649 and CastableAs650 (#2999777)
    - assertion in StatelessExtFunctionCallIterator (#3012651)
    - http-client return type handling for (*+xml and text/html)
  * optimization of fn:subsequence
  * new xqDoc function (xqdoc-content) taking a documented module as string
  * new xqDoc feature; reporting functions invoked from within a particular function
  * xqDoc schema change; name element for functions got an arity attribute
  * added a tidy library module that provides functions to tidy an HTML string
    and returns a valid XHTML document node (http://www.zorba-xquery.com/modules/tidy)
  * added a schema library module that provides XML schema related functions (e.g. schema-type)
    (http://www.zorba-xquery.com/modules/schema)
  * added a node reference library module that provides functions to retrieve the URI
    of a node and vice versa (http://www.zorba-xquery.com/modules/reference)
  * added a hmac module (http://www.zorba-xquery.com/modules/security/hmac)
    that provides an sha1 function (e.g. used in OAuth)
  * added a random module (http://www.zorba-xquery.com/modules/random)
    that provides fuctions for generating (pseudo-)random integers and UUIDs.

version 1.2
  * more introspection functions (e.g. in-scope-element and in-scope-attribute)
  * first prototype for higher order functions from XQuery 1.1
  * JSON module in (com/zorba-xquery/www/modules/json)
  * huge performance improvements
  * added an Atom schema to the build-in schemas
  * register a callback function in the static context that is called
    if a collection or index declaration is processed (compiled)
  * nondeterministic (instead of sequential) functions in the file module
  * reference counting the store (de)initialization
  * many bug fixes; for example
    - compile with Xerces 3.1
    - loading external functions (prefix problem)
    - plan serializer fixes
    - serialization fixes
    - base64 decoder
    - loading documents with general entities
    - EXPATH http-client fixes
    - not hoisting nondeterministic functions
    - scripting related fixes
    - unicode related fixes (e.g. for parameters to the doc function)
    - StaticContext::loadProlog fix
    - SAX serialization fix

version 1.0
  * Changes in the C++ API
    * Removed ResultIterator class. All public API methods use simply
      Iterator.
    * Added a new class named ExternalModule.
      This class must be used for registering external functions.
      This change makes the external function API incompatible with
      previous releases.
    * Loading pre-compiled queries (using loadExecutionPlan) requires to pass
      a SerializationCallback which is used for
      retrieving registered uri resolvers or trace streams.
      Moreover, the callback is used for retrieving ExternalModules
      which have been used when compiling the query.
    * Changed the append function in zorba::String to const. Now, the
      function does not change the String itself, but returns a new
      String. Furgthermore zorba::String::append can now handle other
      zorba::String objects - not only const char*. Also the operators
      + and += are defined on zorba::String.
  * Other language bindings (Java, PHP, python, ruby) also now use
    simply Iterator; ResultIterator removed.
  * XQC (C language binding) brought up-to-date with latest revision
    of that spec (https://xqc.sourceforge.net).
  * Resolving of modules is now enhanced by the so called "Zorba
    Module Path".  Moreover, multiple ModuleURIResolvers can be
    registered in one StaticContext.  See the documentation for more
    information.
  * Added static and dynamic context introspection modules.
  * Added the excel library to the built-in modules.
    Implemented the most used excel functions.
  * Added the math library to the built-in modules (the namespace has
    changed to http://www.zorba-xquery.com/modules/math)
  * Pass the Static- and DynamicContext as parameter to the evaluate function
    of external functions.
  * The XQuery class got a setTimeout option that allows the user to set a
    maximum running time of a particular query execution.
  * The StatelessExternalFunction is now non-pure by default. There is
    a new subclass called PureStatelessExternalFunction which should
    be used instead. PureStatelessExternalFunctions don't have access
    to the Static- and DynamicContext.
  * Renamed XQuery::serialize to XQuery::execute. The new method also
    implements the functionality of the XQuery::applyUpdates method
    (which was removed).
  * Added the serialize library to the built-in modules. The function
    util:serialize-to-string has been removed.
  * The DynamicContext can be used to pass arbitrary name-value pairs
    to the evaluate method of external functions.
  * Implemented CSV to XML converters. See csv2xml.xq module.
    You can convert back and forth between CSV files and XML
    or formated text files and XML.
  * Changes in the email functionnality
    * implemented smtp:send functions as external functions
    * added support for MIME messages (Text in character sets other
      than ASCII, Non-text attachments, Message bodies with multiple
      parts, Header information in non-ASCII character sets)
  * most of the runtime iterators and functions are generated
    (see https://sourceforge.net/apps/mediawiki/zorba/index.php?title=Creating_New_Runtime_Iterators_and_Functions)
  * improved exception messages raised by the serializer
  * Json is now able to parse Unicode messages
  * improved functionality for java, php, python and ruby bindings.

version 0.9.8-rev1 (2009.09.22)
  * bug fixes
    * fixed a crash caused by converting long integers (> 1024 digits)
      to string
    * the compile-only check reports the URI of the encapsulating
      entity in it's error report (used for XQDT semantic checking)
    * fixed 'for $x in () return $x/test' to return the empty sequence
      instead of raising a static error
    * fixed build using Xerces-C 3.0.1
    * fixed build for Mac OS X 10.6 (Snow Leopard)
    * improved error reporting in the command line utility
    * improved detection of the installed version of Xerces-C (raise
      an error if a wrong version is installed)

version 0.9.8 (2009.08.26)
  * More XQuery Scripting Features
    * default initialization for external variables
    * block local variables
  * XQuery 1.1
    * Support for the "validation as TypeName" feature
    * Changed the try/catch syntax as specified in XQuery 1.1 (except
      the try- and catch expressions are ExprSingle and not Expr).
  * Examples for the Java API
  * Function library
  * creating PDFs using XSL Formatting Objects (requires Java)
  * util:parse function
  * converter functions to/from JSON or JsonML and XML
  * function for sending simple text emails
  * the util:tidy function returns a node instead of a string.
  * XQDoc module http://www.zorba-xquery.com/zorba/xqdoc-functions
  * Added a loadProlog function to the static context.
  * Added support for XQueryX and XQueryX Update
  * Added compiled query persistence to the C++ API
    (XQuery::loadExecutionPlan() and XQuery::saveExecutionPlan())
  * Added a printPlan function to the XQuery class of the API.
  * Added new option in the Zorba command line utility: compile-only,
    parse-only, lib-module, print-errors-as-xml.
  * Added two plan printing function (printPlanAsXML and
    printPlanAsDOT) to the SWIG generated APIs.
  * Implemented 'declare option': options are set in the static context.
  * fn:trace can be disabled by setting the option
    QName("http://www.zorba-xquery.org/option", "trace") to "disable".
  * Changed the scripting syntax of the exit expression from 'exit
    with' to 'exit returning'.This is due to an ambiguity in the
    grammar (see http://www.w3.org/Bugs/Public/show_bug.cgi?id=6852
    for more information).
  * Added accessor functions for node items to the Item class in the
    API (i.e. getChildren, getAttributes, and getNodeName).
  * Added a UserException to the API which is raised if the user makes
    a call to the fn:error function.
  * UTF8 support for the lexer
  * bug fixes and performance improvements

version 0.9.5 (2008.02.17)
  * Unified the Tidy and Rest API's
  * Added new sinatures to zorba-util:tidy and zorba-util:tdoc that
    allow setting of tidy functions
  * Added Schema imports using target namespace or location hints
  * Added StaticContext::findFunctions and StaticContext::disableFunciton
  * Added Functions for collections
  * Windows packages include a zorba_simplestore.dll
  * Improved error messages for regular expression processing
  * Added functions to return an item instead of xs:string
  * Added a new signature to zorba-util:random in order to be able to call
    random within a loop and get different numbers each time.
  * Corrected the types of some functions/operators (YM_DURATION or
    DT_DURATION instead of DURATION).
  * Now possible to pass empty sequence as collection URI.
  * Now cURL is set to follow an infinite number of redirects.
  * Added validate after update
  * Fixed schema files without target namespace.
  * Fixed notation cast.
  * Added list and union item types to type manager cache
  * Added validation tests for schema substitution groups
  * Added message when error during update test driver.
  * Added partial support for scripting (XQSE)
  * Added support "default element namespace" schema imports
  * Added support variable initializers that refer to forward variable
    declarations.
  * Various bug fixes and performance enhancements.

version 0.9.4 (2008.10.06)
  * added General FLWOR (GFLWOR)
    * added Windowing functionality
    * added ability to perform "outer" joins in the FLWOR with outer
      for clauses
    * output numbering added to FLWOR
  * Added HTTP support to module import
  * fn:parse() is implemented as per the XQuery proposal
  * Extended api to register user-defined URI resolvers for documents,
    collections, schemas, and modules
  * boost dependencies removed
  * Added xquery debugging support
  * Added a store implementation based on Windows DOM.
  * Added functions to make calls to REST based web services through XQuery
  * Added PHP bindings to zorba
  * Added tidy support to convert web pages into xhtml.
  * Added XML Schema support for validation
  * Added the ability to revalidate XML data with respect to a Schema
    after applying updates

version 0.9.21-4303 (2008.06.26):
  * fixed installation problem for python and ruby language bindings
  * fixed some valgrind reported memory problems
  * other minor bug fixes and performance improvements

version 0.9.2-4251 (2008.06.19):
  * Module support (as in the XQuery 1.0 W3C recommendation)
  * Removed boost shared pointers from the API
  * Performance improvements and bug fixes
  * C API (zorbac.h)
  * Rudimentary SWIG interface for generating other language bindings
    (i.e. Ruby and Python)
  * Added support for running multiple queries in the command line utility
  * group by (as in the evolving W3C XQuery 1.1 recommendation)
  * try-catch (as in the evolving W3C recommendation)
  * eval facility to dynamically evaluate a string and execute it as a query
  * some math functions (e.g. sqrt, sin, cos, etc)
  * Basic schema validation (without post schema validation and
    substitution groups)
  * Stabilized the Store API & build the simplestore as a separate library

version 0.9.1 (2008.04.30):
  * Initial release supporting
    * XQuery 1.0 and XPath 2.0 (as in the W3C recommendation)
      except modules and only limited support for schema validation
    * XQuery Update Facility 1.0 (as in the evolving W3C recommendation)
    * An In-Memory (replaceable) XML store
      (implements the XQuery Data Model (XDM) W3C recommendation)
  * This release 0.9 passes 97.6% of the W3C tests of XQuery 1.0 test suite
    and 99.4% of the XQuery Update Facility test suite.