Sybase PowerDesigner XML User Manual page 86

Defining identity constraints
Defining field general properties
74
The General page of a field property sheet displays the following properties:
Property Description
XPath An XPath expression relative to each element selected by the
selector of the identity constraint. It identifies a single element
(with a simple type) whose content or value is used for the
identity 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 field. Its value must be of type ID and unique within
the model containing the field
To create an identity constraint field:
1 Click the Fields tab of an identity constraint (unique, key or keyRef)
property sheet.
2 Click any empty line in the Fields page.
An arrow appears at the beginning of the line.
3 Type an XPath expression.
4 Click Apply.
5 Double-click the arrow left of the row.
PowerDesigner