/usr/share/help/rarian.document is in librarian-dev 0.8.1-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Rarian meta-data
[Document]
Name=Rarian Reference Manual
Comment=Rarian is a documentation meta-data library. This describes how to write documentation accessible to it and how to use the library.
DocIdentifier=org.other.rarian
Categories=Development|Libraries
DocPath=/usr/share/librarian/manual/index.xhtml
DocType=application/xhtml+xml
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