/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/ is in libdecentxml-java-doc 1.4-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DTDTokenizer.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocType.DocTypeType.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocType.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeAttributeList.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeElement.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeEntity.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeEntityResolver.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeNode.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeNotation.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/DocTypeText.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DTDTokenizer.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocType.DocTypeType.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocType.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeAttributeList.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeElement.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeEntity.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeEntityResolver.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeNode.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeNotation.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/class-use/DocTypeText.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/package-frame.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/package-summary.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/package-tree.html
/usr/share/doc/libdecentxml-java/api/de/pdark/decentxml/dtd/package-use.html