13.6. The selector Element
The value of the xpath attribute of a selector element specifies a target node set for any type of identity constraint. See any listing in this chapter for an example of the selector element.
13.6.1. The Attributes of a selector Element
In addition to the ubiquitous id attribute, the selector element must specify an xpath, which selects a set of nodes. Table 13.8 itemizes the attributes of a selector element.
| Attribute | Description |
|---|---|
| id | The value of an id attribute uniquely identifies an element within the set of schema documents that comprise an XML schema. |
| xpath | The value of the xpath attribute determines the target node set of a corresponding XML instance. |
13.6.1.1. ...
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