Ziphelp Sitemaps

Ziphelp is an extension of the sitemap protocol.

The purpose of the Ziphelp extension is to improve an HTML-based help system by adding context-sensitive information, as is typically used in desktop applications. It does this by defining help context numbers, help keywords and associative keywords, which are not present in the regular sitemap protocol. An application (desktop / mobile / web) may use this information structure to navigate the help system and provide accurate context-sensitive help for the end user.

https://www.helpandmanual.com/ziphelp/schema/sitemap-ziphelp.xsd