/usr/include/xalanc/XalanEXSLT/ is in libxalan-c-dev 1.11-6.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xalanc/XalanEXSLT/XalanEXSLTCommon.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTCommonImpl.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTDateTime.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTDateTimeImpl.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTDefinitions.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTDynamic.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTDynamicImpl.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTMath.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTMathImpl.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTSet.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTSetImpl.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTString.hpp
/usr/include/xalanc/XalanEXSLT/XalanEXSLTStringImpl.hpp