XHTML
From Friend2Friend Wiki
XHTML (Extensible Hypertext Markup Language) is the W3C's XML-isation of the legacy HTML. It is not so different from HTML, but much stricter on conformance, since it is XML.
Relevance to F2F
F2F modules present information to users in XHTML, using SVG for images. A module's displays (especially ) typically transform that module's XML data into XHTML.
There may be elements of XHTML which we would like to filter out, e.g. for security purposes.
