How to access attribute in xml payload?111

 How to access attribute in xml payload?

There are two primary ways to access attributes within an XML payload using DataWeave:

1. Using the @ symbol:

This is the most common approach for directly accessing an attribute's value based on its name.

Here's the syntax:

<elementName>@<attributeName>

Example:

%dw 2.0
---
name = message.customer@name
---

In this example, message.customer@name retrieves the value of the name attribute from the customer element within the message payload.

2. XPath expressions:

You can leverage XPath expressions for more complex scenarios, especially when dealing with nested elements or attributes with dynamic names.

Here's an example:

%dw 2.0
---
//book[@isbn="1234567890"]/@title
---

This expression searches for the book element with the isbn attribute value "1234567890" and then retrieves the value of the title attribute from that specific element.

Additional Points:

• Ensure the namespace prefix is included if the attribute belongs to a different namespace than the element.

• DataWeave offers other operators like .. for parent-child navigation and | for selecting multiple elements, which can be combined with the @ symbol for complex attribute access.

Here are some helpful resources for further exploration:

• DataWeave XML processing: https://docs.mulesoft.com/dataweave/latest/dataweave-formats-xml

• XPath Tutorial: https://www.w3schools.com/xml/xpath_intro.asp

Remember:

• DataWeave operates on a parsed XML structure. Ensure your payload is valid XML before attempting to access attributes.

• Error handling mechanisms are recommended to gracefully handle situations where the expected element or attribute might not be present.