The <cxxVariableDeclarationFileLine> element is defined within <cxxVariableAPIItemLocation>. <cxxVariableDeclarationFileLine> specifies the line on which the API is declared.
The element <cxxVariableDeclarationFileLine> is empty but for the required attributes name and value. The name attribute is always "lineNumber" and value is the line number which the variable is declared on.
<cxxVariableAPIItemLocation>
<cxxVariableDeclarationFile name="filePath" value="C:/src/include/e32base.h"/>
<cxxVariableDeclarationFileLine name="lineNumber" value="1664"/>
</cxxVariableAPIItemLocation>