The <cxxStructBaseStruct> element declares inheritance from a base struct in a struct derivation.
Used within a <cxxStructDerivation> element to declare inheritance from a base struct.
<cxxStructDerivation>
<cxxStructDerivationAccessSpecifier value="public"/>
<cxxStructBaseStruct href="struct_base">Base</cxxStructBaseStruct>
</cxxStructDerivation>