DataWeave 2.2 is compatible and bundled with Mule 4.2. Standard Support for Mule 4.2 ended on May 2, 2021, and this version of Mule will reach its End of Life on May 2, 2023, when Extended Support ends.

Deployments of new applications to CloudHub that use this version of Mule are no longer allowed. Only in-place updates to applications are permitted.

MuleSoft recommends that you upgrade to the latest version of Mule 4 that is in Standard Support so that your applications run with the latest fixes and security enhancements.

attr(Namespace | Null, String): PathElement

This function creates a PathElement to use for selecting an XML attribute and populates the type’s selector field with the given string.

Some versions of the update and mask functions accept a PathElement as an argument.


Name Description


The namespace of the attribute to select. If not specified, a null value is set.


The string that names the attribute to select.


This example creates an attribute selector for a specified namespace (ns0) and sets the selector’s value to "myAttr". In the output, also note that the value of the "kind" key is "Attribute".


%dw 2.0
output application/json
import * from dw::util::Values
ns ns0 http://acme.com/fo
attr(ns0 , "myAttr")


   "kind": "Attribute",
   "namespace": "http://acme.com/foo",
   "selector": "myAttr"

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