/usr/include/xqilla/ast/ is in libxqilla-dev 2.3.0-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/xqilla/ast/ASTNode.hpp
/usr/include/xqilla/ast/ASTNodeImpl.hpp
/usr/include/xqilla/ast/ContextTuple.hpp
/usr/include/xqilla/ast/ConvertFunctionArg.hpp
/usr/include/xqilla/ast/CountTuple.hpp
/usr/include/xqilla/ast/ForTuple.hpp
/usr/include/xqilla/ast/LetTuple.hpp
/usr/include/xqilla/ast/LocationInfo.hpp
/usr/include/xqilla/ast/NumericFunction.hpp
/usr/include/xqilla/ast/OrderByTuple.hpp
/usr/include/xqilla/ast/StaticAnalysis.hpp
/usr/include/xqilla/ast/StaticType.hpp
/usr/include/xqilla/ast/TupleNode.hpp
/usr/include/xqilla/ast/WhereTuple.hpp
/usr/include/xqilla/ast/XQAnalyzeString.hpp
/usr/include/xqilla/ast/XQApplyTemplates.hpp
/usr/include/xqilla/ast/XQAtomize.hpp
/usr/include/xqilla/ast/XQAttributeConstructor.hpp
/usr/include/xqilla/ast/XQCallTemplate.hpp
/usr/include/xqilla/ast/XQCastAs.hpp
/usr/include/xqilla/ast/XQCastableAs.hpp
/usr/include/xqilla/ast/XQCommentConstructor.hpp
/usr/include/xqilla/ast/XQContextItem.hpp
/usr/include/xqilla/ast/XQCopy.hpp
/usr/include/xqilla/ast/XQCopyOf.hpp
/usr/include/xqilla/ast/XQDOMConstructor.hpp
/usr/include/xqilla/ast/XQDocumentConstructor.hpp
/usr/include/xqilla/ast/XQDocumentOrder.hpp
/usr/include/xqilla/ast/XQEffectiveBooleanValue.hpp
/usr/include/xqilla/ast/XQElementConstructor.hpp
/usr/include/xqilla/ast/XQFunction.hpp
/usr/include/xqilla/ast/XQFunctionCall.hpp
/usr/include/xqilla/ast/XQFunctionCoercion.hpp
/usr/include/xqilla/ast/XQFunctionConversion.hpp
/usr/include/xqilla/ast/XQFunctionDeref.hpp
/usr/include/xqilla/ast/XQFunctionRef.hpp
/usr/include/xqilla/ast/XQGlobalVariable.hpp
/usr/include/xqilla/ast/XQIf.hpp
/usr/include/xqilla/ast/XQInlineFunction.hpp
/usr/include/xqilla/ast/XQLiteral.hpp
/usr/include/xqilla/ast/XQMap.hpp
/usr/include/xqilla/ast/XQNamespaceBinding.hpp
/usr/include/xqilla/ast/XQNamespaceConstructor.hpp
/usr/include/xqilla/ast/XQNav.hpp
/usr/include/xqilla/ast/XQOperator.hpp
/usr/include/xqilla/ast/XQOrderingChange.hpp
/usr/include/xqilla/ast/XQPIConstructor.hpp
/usr/include/xqilla/ast/XQPartialApply.hpp
/usr/include/xqilla/ast/XQPredicate.hpp
/usr/include/xqilla/ast/XQQuantified.hpp
/usr/include/xqilla/ast/XQReturn.hpp
/usr/include/xqilla/ast/XQSequence.hpp
/usr/include/xqilla/ast/XQStep.hpp
/usr/include/xqilla/ast/XQTextConstructor.hpp
/usr/include/xqilla/ast/XQTreatAs.hpp
/usr/include/xqilla/ast/XQTypeswitch.hpp
/usr/include/xqilla/ast/XQValidate.hpp
/usr/include/xqilla/ast/XQVariable.hpp