Validity and RELAX

<<< Of course, just because an English sentence has proper spelling, grammar, and punctuation doesn't make it meaningful:

The brick astonished the sunlight.

Similarly, there are some questions about the weather report that the DTD can't answer:

To be able to do this level of validation, Mr. Makoto Murata has invented RELAX, a markup language that lets you describe how other XML languages are to be validated. Since RELAX is itself in XML, it's much easier to read than a DTD. [Note: This material is based on the How to RELAX tutorial.] Let's start with the skeleton of a RELAX document to describe EWEML.

    <export label="report"/>

Since we are using XML tags to define another set of XML tags, the attributes in the opening <module> tag establish namespaces so that we can know whose tag names are whose.

The <interface> tag specifies the name of the “root element” of our EWEML documents.

Now let's fill in more of the RELAX document. >>>

  1. Validating XML with RELAX
  2. Validity and the DTD
  3. Validity and RELAX
  4. Specifying Elements
  5. Making Validation More Specific
  6. Further Specifications
  7. Enumerations
  8. The Big Picture
  9. Summary