RELAX NG by Eric van der Vlist will be published by O'Reilly & Associates (ISBN: 0596004214)
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An enumeration is a choice between several values. Enumerations are thus written in RELAX NG by combining the choice pattern with the value pattern. In our library, a good candidate for an enumeration is the available attribute, which could be defined as:
<attribute name="available">
<choice>
<value>available</value>
<value>checked out</value>
<value>on hold</value>
</choice>
</attribute> |
or:
attribute available {"available"|"checked out"|"on hold"} |
This definition will validate values such as "available", "checked out" and "on hold". It will also validate values such as " available ", "checked out " or even " on hold " with multiple spaces, tabs or carriage returns between "on" and "hold" or "checked" and "out". We will see the reason for this behavior--and how to change it if needed--in the next section.
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All text is copyright Eric van der Vlist, Dyomedea. During development, I give permission for non-commercial copying for educational and review purposes. After publication, all text will be released under the Free Software Foundation GFDL.