/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/ is in libdoxia-sitetools-java-doc 1.1.4-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/DecorationXpp3Reader.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/DecorationXpp3Writer.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/class-use//
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/class-use/DecorationXpp3Reader.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/class-use/DecorationXpp3Writer.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/package-frame.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/package-summary.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/package-tree.html
/usr/share/doc/libdoxia-sitetools-java/api/org/apache/maven/doxia/site/decoration/io/xpp3/package-use.html