September 2002
Intermediate to advanced
1008 pages
22h 3m
English
book
XML Schema Complete Reference, The
by Cliff Binstock, Chris Galtenberg, Mike Wooding, Chris Dix, Mitchell Smith, Dave Peterson
Content preview from XML Schema Complete Reference, The
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13.7. The field Element
The value of the xpath attribute of a field element specifies a key for any type of identity constraint. In an XML instance, a key sequence is the set of keys that correspond to the set of fields for an identity constraint. See any listing in this chapter for an example of the field element.
13.7.1. The Attributes of a field Element
The field element has the same attributes as the selector element. Table 13.10 itemizes these attributes.
| 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 one key value from the target node ... |
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