updates README.md

Author: michikommader

README.md

@@ -3,28 +3,44 @@ Easily accessible C++ object structure of [OpenDRIVE](http://opendrive.org/) aut
 
 ## Building
 ### Dependencies
-Make sure to meet these dependencies in advance: 
-- [CodeSynthesis XSD](http://codesynthesis.com/products/xsd/) in conjunction with 
+
+- [CodeSynthesis XSD](http://codesynthesis.com/products/xsd/)
 - [Xerces-C++](https://xerces.apache.org/xerces-c/)
 
 ### Building on Unix
-With CMake as plattform-independent build tool **xodr** can be configured for various native build environments. An exemplary configuration for Make under Unix:
+
+For an exemplary build on a fresh Ubuntu Linux 20.04 x64 (gcc 9.3.0) we first install the dependencies:
+
+```
+sudo apt install xsdcxx
+sudo apt install libxerces-c-dev
+```
+
+With CMake as plattform-independent build tool **xodr** can be configured for various native build environments. For our Ubuntu environment with Make:
+
 ```
 cd xodr
 mkdir build
 cd build
 cmake ..
 ```
+
 To build the project afterwards run
+
 ```
 make
 ```
-If everything went fine you will find the resulting library in the `lib/` folder of the project root.
+
+If everything went fine, you will find the resulting library in the `lib/` folder of the project root.
 
 ## Source Code Generation
-For convenience the underlying OpenDRIVE schema is provided in `schema/` but can be obtained from the [OpenDRIVE download section](http://opendrive.org/download.html) in recent and previous versions. The C++ class structure was generated with [CodeSynthesis XSD](http://codesynthesis.com/products/xsd/) and can be automatically re-generated using the XML data binding tool `xsd`. The code used in **xodr** was generated with `xsd` version 4.0.0 as follows:
+
+For convenience the underlying OpenDRIVE schema is provided in `schema/` but can be obtained for free from [ASAM](https://www.asam.net/standards/detail/opendrive/) in recent and previous versions. The C++ class structure was generated with [CodeSynthesis XSD](http://codesynthesis.com/products/xsd/) and can be automatically re-generated using the XML data binding tool `xsd`. The code used in **xodr** was generated with `xsd` version 4.0.0 as follows:
+
 ```
 xsd cxx-tree --hxx-suffix .h --cxx-suffix .cpp --reserved-name access=parkingSpace_access --reserved-name link=lane_link schema/OpenDRIVE_1.4H.xsd
 ```
+
 ## Licence
+
 Due to XSD's [FLOSS Exception](http://www.codesynthesis.com/projects/xsd/FLOSSE) the generated code is includable in various Free/Libre and Open Source Software projects, see [XSD Licence](http://www.codesynthesis.com/products/xsd/license.xhtml).