Sweble is an alternative parser for MediaWiki's Wikitext, written in Java.
AST documentation 
The Sweble parser produces an abstract syntax tree (AST) as output. The AST is, as the name suggests, close to the actual syntax of the Wikitext document. It is also specific to the design of the parser and the surrounding framework and therefore not practical as data interchange or storage format. A brief description of the AST used by the Sweble parser can be found in the Sweble repository tree.
The eXtensible Wikitext Markup Language is an XML language designed to work as data exchange and storage format for articles written in MediaWiki's Wikitext. The language is defined in an technical report that can be found in the download section of the Sweble wiki.
The XML Schema file that defines XWML cane be found in the Sweble repository tree.
Wom Java interfaces 
The Wikitext Object Model (WOM) is defined in the same technical report in which the XWM language is defined. The WOM is similar to the Document Object Model (DOM) of HTML which defines a way to access and modify an HTML document in a program. The WOM Java interfaces define a way to access and modify a XWML document inside a program. The Java interfaces can be found in the Sweble repository tree.