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Chapter 2 Building an XML model
XSM User's Guide 69
KeyRef general properties
The General page of a keyRef property sheet displays the following
properties:
Property Description
Name Name of the keyRef constraint. It must be a no-colon-name
(See Glossary)
Code Code of the keyRef constraint. It must be a no-colon-name
Comment Descriptive label of the keyRef constraint
Stereotype Sub-classification used to extend the semantics of an object
without changing its structure. It can be predefined or user-
defined
ID ID of the keyRef constraint. Its value must be of type ID and
unique within the model containing the keyRef constraint
Reference Name of a key or a unique constraint defined in the current
model (or another model with a specified namespace). The
Reference value must be a qualified name (See Glossary)
Selector (XPath) An XML Path Language expression that selects a set of
elements across which the values specified in the Fields page
must be unique. There must be one and only one selector
For more information on Selector or XPath, see section Defining an
identity constraint selector.
KeyRef fields properties
The Fields page of a keyRef property sheet displays a list of XPath
expressions.
If there is more than one field (or XPath expression), the combination of
fields must be unique.
For information on XPath expressions, see section Defining an identity
constraint selector.
Creating an identity constraint
You create an identity constraint from an element property sheet.