Hp e-CommerceXML Accelerator sa7150 Manuel d'utilisateur télécharger pdf (Page 30)

C H A P T E R 3 HP e-Commerce/XML Server Accelerator SA7150 User Guide

Negation Operator

The “*” and “!” operators are allowed in URI expressions, but they

can exist only at the beginning or end of an expression. Also, a

positive expression must appear after a not (!) expression, otherwise

the (!) expression has no effect.

The order of URI expressions is significant only when the “not” (!)

operator is used.

Operators

NOTE: The SA7150 uses

a subset of the XPath

Language standard.

XML expressions consist of sequences of one or more XML elements

or attributes combined with various “operators.” “Step operators” tell

the SA7150 where in the XML data tree to look, while “comparison

operators” tell the SA7150 what to look for. In typical XML

expressions, elements are separated by step operators—single or

double slashes (/ or //). These are used to select elements according to

their location (“node”) in the XML data tree. Step operators are

described in the table above. Comparison operators are the familiar

“equal to,” “not equal to,” “greater than,” “less than,”and other such

symbols. These form the bases upon which the SA7150 compares

incoming XML data to its own XML patterns to decide where to send

each XML document for fulfillment.

Expression Yields

!*.asp

All non-ASP requests

!*/PurchaseOrder

All non-PurchaseOrder requests

!/Buy.cgi

All non-Buy.cgi requests

Use of the Negation Operator

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 211 212

Pas de commentaire

Hp e-CommerceXML Accelerator sa7150 Manuel d'utilisateur Page 30