Hp e-CommerceXML Accelerator sa7150 Manuel d'utilisateur télécharger pdf (Page 31)

C H A P T E R 3 XML Operations

An XML expression’s first element must be preceded by a step

operator.

The node to the left of the last step operator in an XML expression is

the “context node,” i.e., the node that establishes the level within the

XML data tree’s hierarchy at which the SA7150 searches for a match

when comparing XML data to XML expressions. The “root node” is

the top level of the XML data tree, and by implication is to the left of

an XML expression’s left-most step operator. Some examples of the

effects of step operators are:

• //address Tells the SA7150 to search for the <address>

element anywhere in the XML data tree.

• //employee//state Tells the SA7150 to search anywhere

under the <employee> element node for the <state>

element.

• //employee/address Tells the SA7150 to search one level

below the <employee> node for the <address> element.

You can specify an element as “*”, which selects any element relative

to the context node. You can also specify an optional filter at the end

of a path to further refine parsing of the XML data stream.

Step

Operator

Name Description

Child

operator

Selects all immediate children of the context node

Descendant

operator

Selects elements at any level under the context node

XML Step Operators

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Hp e-CommerceXML Accelerator sa7150 Manuel d'utilisateur Page 31