<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
    <ClCompile>
      <PrecompiledHeader>Create</PrecompiledHeader>
      <WarningLevel>Level4</WarningLevel>
      <Optimization>Disabled</Optimization>
      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;ELEC_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <RuntimeTypeInfo>false</RuntimeTypeInfo>
      <AdditionalIncludeDirectories>
      </AdditionalIncludeDirectories>
      <EnableEnhancedInstructionSet>AdvancedVectorExtensions</EnableEnhancedInstructionSet>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
    </Link>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
    <ClCompile>
      <WarningLevel>Level4</WarningLevel>
      <PrecompiledHeader>Create</PrecompiledHeader>
      <Optimization>MaxSpeed</Optimization>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <IntrinsicFunctions>true</IntrinsicFunctions>
      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;ELEC_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <CompileAsManaged>
      </CompileAsManaged>
      <RuntimeTypeInfo>false</RuntimeTypeInfo>
      <AdditionalIncludeDirectories>
      </AdditionalIncludeDirectories>
      <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
    </ClCompile>
    <Link>
      <SubSystem>Windows</SubSystem>
      <GenerateDebugInformation>true</GenerateDebugInformation>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>
      <OptimizeReferences>true</OptimizeReferences>
    </Link>
  </ItemDefinitionGroup>

tree = etree.parse(xml)
ns = {'ns': 'http://schemas.microsoft.com/developer/msbuild/2003'}

debug = tree.xpath('//ns:ItemDefinitionGroup[@Condition="'$(Configuration)|$(Platform)'=='Release|x64'"]', namespaces=ns)
for d in debug:
    print(d)
    for g in d:
        print(g)

<Element {http://schemas.microsoft.com/developer/msbuild/2003}ClCompile at 0x7f95a2eb2548>
Level4
Create
MaxSpeed
true
true
WIN32;NDEBUG;_WINDOWS;_USRDLL;ELEC_EXPORTS;%(PreprocessorDefinitions)


false


StreamingSIMDExtensions2
<Element {http://schemas.microsoft.com/developer/msbuild/2003}Link at 0x7f95a2eb25c8>
Windows
true
true
true
No dependencies

tree.xpath('//ns:ItemDefinitionGroup[@Condition="'$(Configuration)|$(Platform)'=='Release|x64'"]/ClCompile/Optimization', namespaces=ns)