Evaluates its text content as an XPath expression. The result can be assigned to a variable.
<eval out="$mock">false()</eval>The action is mostly used to assign variables.
Besides atomic values such as strings, numbers and booleans, an expression may yield a DOM node-set:
<eval out="$parts">split($request/path, "/")</eval><eval out="$links">content()/html/body//a[@href] | content()/html/head/link[@href]</eval>If you need to create a structured JSON object use templating.
The action body must contain an XPath expression.
out is optional. If defined, it must contain a variable name. If no out is
given, the result is discarded.
Omitting output is useful to call functions with side-effects:
<eval>fit-log(concat("login error for user ", $request/post/username))</eval>