php-xml-dtd 0.5.2+dfsg1-3 (armhf binary) in ubuntu utopic

 Parsing of DTD files and DTD validation of XML files. The XML validation
 is done with the php sax parser, the xml extension, it does not use the
 domxml extension. Currently supports most of the current XML spec,
 including entities, elements and attributes. Some uncommon parts of the
 spec may still be unsupported.