The <cxxClassBaseStruct> element declares inheritance from a base struct in a class derivation.
Used within a <cxxClassDerivation> element to declare inheritance from a base struct.
<cxxClassDerivation>
<cxxClassDerivationAccessSpecifier value="public"/>
<cxxClassBaseStruct href="struct_base">Base</cxxClassBaseStruct>
</cxxClassDerivation>