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Value constraints are usually associated with a simple type; they refine a simple type by defining limits on the values which the simple type can represent. To set the value constraints associated with a simple type:
An enumeration restricts which values can be set for the value constraint. For example, "ABC" and "123". Use this section to create a list of fixed values that the associated type must match.
To set an enumeration:
Set a pattern to indicate that the value constraint defines a string used as a regular expression that must be matched by the data in the associated type. The regular expression syntax supported is a subset of XML Schema regular expressions.
See Regular expression syntax for a list of supported regular expression syntax elements.
To set a pattern: