VoiceXML::Client is a library that provides Perl programs with the ability to act as a user agent that fetches Voice Extensible Markup Language (VoiceXML) documents, parses them, and then executes the instructions therein by playing prompts and collecting user DTMF input/voice recordings through a handle to some type of telephone or other device interface. VoiceXML::Client's focus is on the client side. The XML documents are generated by a distinct process of your choice, unrelated to the library.
xml-test checks that an XML document is included in another document. It is handy when testing an application's output against a document where element order is different (GData and Atom are examples of specifications where element order is unimportant). It has a relaxed notion of containment: element order is ignored, whitespace is trimmed, comments are ignored, specific elements can be ignored by passing XPath-like paths on the command line, and text nodes (element and attribute content) can be ignored by passing '-notext' on the command line.
SimpleXML for PHP 4 is a class that can be used to load XML documents under PHP 4 like the PHP 5 SimpleXML extension. It can load and parse a XML document file like the simple_xml_load function. The class reorganizes the parsed document nodes to return a document structure identical to the result of the simple_load_file function.