SEO Glossary - Letter X
XHTML
Extensible hypertext markup language is a hybrid between HTML 4.0 and XML. The main goal of XHTML is to provide a way for authors to update their HTML documents so that they are compliant with the XML standard, thus allowing them to be viewed with the next generation of XML browsers.
XML
Extensible markup language is used primarily for Web pages. XML allows the author to extend and customize basic HTML formatting by creating proprietary tags and text behaviors. XML is meant to emphasize intelligent and logical formatting within technical documents in order to streamline searching and categorizing, and to ensure total cross-browser compatibility.
XSSI
eXtended server-side includes (XSSI) is part of Apache, a freely distributed Web-server application that's used by many sites, including HotWired. The XSSI module (mod_include) defines a set of commands that Apache will parse after a page is requested, but before it's sent to the browser. Unlike client-side scripting languages such as JavaScript, XSSI isn't dependent on the capabilities of the browser and is relatively inexpensive for the server. XSSI allows a variety of variables to pass according to set parameters (this is where the \"extended\" part comes in), while server-side includes are usually limited to including HTML fragments into a served document.
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