Ruby/htree - HTML/XML tree library

htree provides a tree data structure representing HTML and XML data.

Features:
    * Permissive unified HTML/XML parser
    * byte-to-byte round-tripping unparser
    * XML namespace support
    * Dedicated class for escaped string that eases sanitization
    * XHTML/XML generator
    * template engine
    * recursive template expansion
    * converter to REXML document

WWW: http://www.a-k-r.org/htree/