Chapter 3 Building XML Models

Specifying a constraint selector

A constraint selector specifies an XPath expression that selects a set of elements for a constraint.

To specify a constraint selector:

1. Open the property sheet of a constraint, and enter an XPath expression in the Selector (XPath) field (see XPath abbreviated syntax).
2. Click Apply to make available the Properties tool to the right of the field.
3. Click the Properties tool to open the selector property sheet.
   
4. [optional] Enter additional properties for the selector, and then click OK to return to the constraint.

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