Sybase XML manual Defining selector general properties, ™ To display a selector property sheet

Models: XML

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Defining identity constraints

Syntax

Description

/book/chapter[2]/section[3]

Selects the third section in the second chapter of

 

the book

employee[@dept=”doc”]

Selects all the employee child elements of the

 

context node with a dept attribute set to doc

employee[@dept=”doc”][3]

Selects the third employee child element of the

 

context node with a dept attribute set to doc

employee[3][@dept=”doc”]

Selects the third employee child element of the

 

context node only if it has a dept attribute set to

 

doc

chapter[title]

Selects the chapter child elements of the context

 

node with at least one title child element

chapter[title=”About this

Selects the chapter child elements of the context

book”]

node with at least one title child element with a

 

text content set to About this book

employee[@numEmployee and

Selects all the employee child elements of the

@dept]

context node with the numEmployee and dept

 

attributes

text()

Selects all the child nodes of the text context

 

node

 

 

Defining selector general properties

The General page of a selector property sheet displays the following properties:

Property

Description

XPath

An XPath expression relative to the parent element being

 

declared. It identifies the child elements to which the identity

 

constraint applies

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 selector. Its value must be of type ID and unique within

 

the model containing the selector

 

 

™To display a selector property sheet:

1Type an XPath expression in the Selector groupbox of an identity constraint (unique, key or keyRef) property sheet.

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Page 84
Image 84
Sybase XML manual Defining selector general properties, ™ To display a selector property sheet