PHP and XML
Note: If you're already familiar with the basic concepts of XML, you can safely skip the next sections giving a short introduction to XML, and continue directly with PHP and Expat.
What Is XML?
XML (Extensible Markup Language) is a meta markup language for documents containing structured information. Let's try to explain it word by word in plain English:
XML is extensible. Take HTML: the tag <h1> always denotes a first-level heading. In XML, by contrast, the tag means nothing until you give it a meaning with an accompanying rule, the Document Type Definition (DTD).
XML is a markup language. Just as HTML should, theoretically, XML does not provide layout information to the processing application.
XML is a meta language. XML doesn't ...
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