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This excerpt is taken from No Nonsense XML Web Development with PHP, Site Point’s new release, by Thomas Myer, which was designed to help you start using XML to build intelligent ‘Future-Proof’ PHP applications today.
The title contains over 350 pages of XML and PHP goodies.
With XML (and JSON) the task is not as easy as the data is hierarchical (parent-child relationships exist between records in the schema) and the number of underlying nodes may vary as opposed to tabular data which usually has a constant number of columns separated with a specific delimiter. Sub Test XML() Dim XDoc As Object Set XDoc = Create Object("MSXML2. DOMDocument") XDoc.async = False: XDoc.validate On Parse = False XDoc. Path & "\test.xml") 'Get Document Elements Set lists = XDoc. Using the basics above we can easily move around the document. Well there is an easier way of moving / extracting items using the DOMDocument object – called XPath. XPath is a query language used for selecting XML nodes in an XML document. It allows you to extract any number of nodes (0 or more) which match the specified XPath query.
Like many other Internet standards, the DOM is an official standard of the World Wide Web Consortium, better known as the W3C. In its simplest form, the DOM defines an XML document as consisting as a tree of nodes. On the other hand, the node tree doesn't include XML attributes, though you can retrieve them from the parent elements.
To find out more about “No Nonsense XML Web Development with PHP”, visit the book’s information page, or review the contents of the entire publication. If ever there were a candidate for “Most Hyped Technology” during the late 90s and the current decade, it’s XML (though Java would be a close contender for the title).
As always, you can download this excerpt as a PDF if you prefer. Whenever I talk about XML with developers, designers, technical writers, or other Web professionals, the most common question I’m asked is, “What’s the big deal?
After we’re done exploring some terminology and examples, we’ll jump right in and start working with XML documents.
Then, we’ll spend some time starting the project we’ll develop through the course of this book: building an XML-powered content management system.