XML and object type

[lmazuel]

@RikkiGibson @alexeldeib FYI

For Azure/azure-sdk-for-python#2767

[codecov-io]

Codecov Report

Merging #111 into master will increase coverage by 50.43%.
The diff coverage is 31.81%.

@@             Coverage Diff             @@
##           master     #111       +/-   ##
===========================================
+ Coverage   30.53%   80.97%   +50.43%     
===========================================
  Files         433       12      -421     
  Lines       17422     1708    -15714     
===========================================
- Hits         5320     1383     -3937     
+ Misses      12102      325    -11777

Impacted Files	Coverage Δ
msrest/serialization.py	82.76% <31.81%> (-1.18%)	⬇️
...ModelFlattening/modelflattening/models/__init__.py
...odyComplex/bodycomplex/models/array_wrapper_py3.py
...anilla/Expected/AcceptanceTests/Url/url/version.py
.../bodycomplex/operations/polymorphism_operations.py
...ests/BodyComplex/bodycomplex/models/goblinshark.py
...ateTimeRfc1123/bodydatetimerfc1123/models/error.py
...sibleEnums/extensibleenumsswagger/pet_store_inc.py
...eptanceTests/BodyFormData/bodyformdata/__init__.py
...UriMoreOptions/custombaseurlmoreoptions/version.py
... and 412 more

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