XDV is a way to apply a style/theme contained in a static HTML web page (usually with related CSS, JavaScript and image resources) to a dynamic website created using any server-side technology, using XSLT transformations.
XDV is an implementation of the Deliverance concept using pure XSLT. In short, it is a way to apply a style/theme contained in a static HTML web page (usually with related CSS, JavaScript and image resources) to a dynamic website created using any server-side technology.
Consider a scenario where you have a dynamic website, to which you want to apply a theme built by a web designer. The web designer is not familiar with the technology behind the dynamic website, and so has supplied a "static HTML" version of the site. This consists of an HTML file with more-or-less semantic markup, one or more style sheets, and perhaps some other resources like images or JavaScript files.