The <cxxClassDefinitionFile> element is defined within <cxxClassAPIItemLocation>. <cxxClassDefinitionFile> specifies the file in which the API definition is present.
The element <cxxClassDefinitionFile> is empty but for the required attributes name and value. name is always "filePath" and value is the actual file path.
<cxxClassAPIItemLocation> <cxxClassDeclarationFile name="filePath" value="D:/include/headerfile.h"/> <cxxClassDeclarationFileLine name="lineNumber" value="775"/> <cxxClassDefinitionFile name="filePath" value="D:/include/headerfile.h"/> <cxxClassDefinitionFileLineStart name="lineNumber" value="765"/> <cxxClassDefinitionFileLineEnd name="lineNumber" value="787"/> </cxxClassAPIItemLocation>