/usr/include/xqilla/context/ is in libxqilla-dev 2.3.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xqilla/context/Collation.hpp
/usr/include/xqilla/context/ContextHelpers.hpp
/usr/include/xqilla/context/DynamicContext.hpp
/usr/include/xqilla/context/ExternalFunctionResolver.hpp
/usr/include/xqilla/context/ItemFactory.hpp
/usr/include/xqilla/context/MessageListener.hpp
/usr/include/xqilla/context/ModuleResolver.hpp
/usr/include/xqilla/context/RegexGroupStore.hpp
/usr/include/xqilla/context/Scope.hpp
/usr/include/xqilla/context/StaticContext.hpp
/usr/include/xqilla/context/URIResolver.hpp
/usr/include/xqilla/context/UpdateFactory.hpp
/usr/include/xqilla/context/VarHashEntry.hpp
/usr/include/xqilla/context/VariableStore.hpp
/usr/include/xqilla/context/VariableTypeStore.hpp
/usr/include/xqilla/context/impl/
/usr/include/xqilla/context/impl/CodepointCollation.hpp
/usr/include/xqilla/context/impl/CollationImpl.hpp
/usr/include/xqilla/context/impl/ItemFactoryImpl.hpp
/usr/include/xqilla/context/impl/VarHashEntryImpl.hpp
/usr/include/xqilla/context/impl/VarStoreImpl.hpp
/usr/include/xqilla/context/impl/VariableStoreTemplate.hpp
/usr/include/xqilla/context/impl/XQContextImpl.hpp
/usr/include/xqilla/context/impl/XQDynamicContextImpl.hpp