DTDs Part 2: Attributes

As described in the April 2004 issue of CPU - Computer Power User magazine.

Examples

A) Downloadable ZIP File

• There are several examples here -- why not download the whole lot as a ZIP file -- apr04.zip -- and install them on your own machine?

B) The example XML documents

To play with these documents, simply load them into an XML editor and test them for validity, or load them into a browser and view the results. Some editors will test automatically as the file is loaded, while others will require that you select to validate.

• data-1.xml -- Example document and DTD -- The DTD declares default values for the lang and dir attributes of the div element. The DTD completely specifies the elements and content model, and so the document should validate against the DTD.
  (plain text version: data-1.txt)
• data-2.xml -- Example document and DTD -- Similar to data-1.xml, except taht there are no element declarations for the p and div elements. Default values for attributes will be assigned to the div elements, but the document will not validate due to the missing declarations.
  (plain text version: data-2.txt)

C) Some XML Editors with Validation Features

See the listing provided in last month's article (http://www.iangraham.org/writing/cpu-articles/mar04/index.html).