X
Xenu Link Sleuth
Popular free software for checking a site for broken internal or external links and creating a sitemap.
See also:
- Xenu – official site
XHTML
Extensible HyperText Markup Language is a class of specifications designed to move HTML to conform to XML formatting.
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XML
Extensible Markup Language is a simple, very flexible text format derived from SGML, used to make it easy to syndicate or format information using technologies such as RSS.
See also: