xs:field

Specifies an XPath expression that specifies the value used to define an identity constraint. See more info at http://www.w3.org/TR/xmlschema-1/#element-field.

Table 4.19. xs:field properties
Property NameDescriptionPossible Values
XPathRelative XPath expression identifying the field(s) composing the key, key reference, or unique constraint.An XPath expression.
IDThe component id.Any ID.
ComponentThe edited component name.Not editable property.
System IDThe component system id.Not editable property.