XHTML Transitional Usage Statistics -
Websites using XHTML TransitionalThe website claims XHTML Transitional status. XHTML 1.0 Transitional is the same as HTML 4.01 Transitional, but follows XML syntax rules. It supports everything found in XHTML 1.0 Strict, but also permits the use of a number of elements and attributes that are judged presentational, in order to ease the transition from HTML 3.2 and earlier. These include center, u, strike, and applet.
Purl Usage Statistics -
Websites using PurlA persistent uniform resource locator (PURL) is a URL which describes an intermediate location which, when retrieved, results in redirection to the current location of the final resource. The site contains schema information identifying the use of PURL.