IBM WebSphere XS40, Command Reference Manual

Page: 896 / 1066

Syntax
extract input-context output-context expression [ variable ]
Parameters
input-context
Specifies the context to which to apply the XPath expression. Specify
INPUT
to use the initial policy input, which is the original client request or server
response.
output-context
Specifies the context that stores the result of the XPath expression. Specify
OUTPUT
to use the final policy output, which is the transformed client
request or transformed server response
expression
Specifies the XPath expression that is applied and can be expressed in
standard XPath format or as a
var://
URL that expands to an XPath
expression.
variable
Optionally specifies a variable, within the output context, in which to store
the result of the XPath expression.
Guidelines
An
extract
action applies an XPath expression to a context and stores the result in
another context.
In the absence of variable argument, the results of the XPath expression are stored
as the default contents (tree) of the destination context.
Examples
v
Applies the
//games/url
XPath expression to the INPUT context and stores the
result in the
three
context.
# extract INPUT three //games/url
#
v
Applies the
//games/url
XPath expression to the INPUT context and stores the
result in the
url
variable within the
three
context.
# extract INPUT three //games/url var://local/url
#
v
Applies the XPath expression referenced by the local
xpath
variable and stores
the result in the
url
variable within the
three
context.
# extract INPUT three var://local/xpath var://local/url
#
v
Same as the previous example, but note the use of an explicit address for the
optional
variable argument.
# extract INPUT three var://local/xpath var://three/url
#
fetch
Adds a
fetch
action.
Syntax
fetch url output-context
870
Command Reference