YHTML 

YHTML is a markup language based on XML which include all standard HTML tags and attributes as well as some specific tags used to ease the creation of HTML pages, to limit the redundancy of source code and to share data between HTML pages. It includes control and conditional statements, procedure definition, database access facilities, triggers and many other features.

Furthermore, variables and PHP expressions may be used in the XML attributes and XML element values. YHTML statements are interpreted by a PHP module, thus PHP must be installed on the server side so that to support YHTML.

Click the link below to get the reference manual of YHTML language.