The <cxxUnionTemplateParameters> element contains a set of union parameters.
The <cxxUnionTemplateParameters> element contains one or more <cxxUnionTemplateParameter> elements. Each of which describes a union parameter. <cxxUnionTemplateParameters> is declared within <cxxUnionDefinition>
<cxxUnionTemplateParameters>
<cxxUnionTemplateParameter>
<cxxUnionTemplateParameterType>typename T</cxxUnionTemplateParameterType>
<apiDefNote>The type of the first function object. </apiDefNote>
</cxxUnionTemplateParameter>
<cxxUnionTemplateParameter>
<cxxUnionTemplateParameterType>typename U</cxxUnionTemplateParameterType>
<apiDefNote>The type of the second function object. </apiDefNote>
</cxxUnionTemplateParameter>
</cxxUnionTemplateParameters>
cxxUnionTemplateParameter (at least 1)