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Insert Attributes to an XML Tag

DataWeave 2.1 is compatible with Mule 4.1. Standard Support for Mule 4.1 ended on November 2, 2020, and this version of Mule will reach its End of Life on November 2, 2022, 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.

This DataWeave example uses @(key:value) syntax (for example, @(loc: "US")) to inject attributes to XML tags. The example populates the "title" tag with two attributes, and each of the "author" tags with one too.

It uses these functions:

  • mapObject to go through each of the books in the input.

  • map to go through the authors in each book.

DataWeave
%dw 2.0
output application/xml
---
bookstore: payload.bookstore mapObject (book) -> {
      book : {
      title @(lang: "en", year: book.year): book.title,
      price: book.price,
      (book.*author map
      author @(loc: "US"): $)
    }
}
Input
<?xml version='1.0' encoding='US-ASCII'?>
<bookstore>
  <book>
    <title>Everyday Italian</title>
    <year>2005</year>
    <price>30</price>
    <author>Giada De Laurentiis</author>
  </book>
  <book>
    <title>Harry Potter</title>
    <year>2005</year>
    <price>29.99</price>
    <author>J K. Rowling</author>
  </book>
  <book>
    <title>XQuery Kick Start</title>
    <year>2003</year>
    <price>49.99</price>
    <author>James McGovern</author>
    <author>Per Bothner</author>
    <author>Kurt Cagle</author>
    <author>James Linn</author>
    <author>Vaidyanathan Nagarajan</author>
  </book>
  <book>
    <title>Learning XML</title>
    <year>2003</year>
    <price>39.95</price>
    <author>Erik T. Ray</author>
  </book>
</bookstore>
Output XML
<?xml version='1.0' encoding='US-ASCII'?>
<bookstore>
  <book>
    <title lang="en" year="2005">Everyday Italian</title>
    <price>30</price>
    <author loc="US">Giada De Laurentiis</author>
  </book>
  <book>
    <title lang="en" year="2005">Harry Potter</title>
    <price>29.99</price>
    <author loc="US">J K. Rowling</author>
  </book>
  <book>
    <title lang="en" year="2003">XQuery Kick Start</title>
    <price>49.99</price>
    <author loc="US">James McGovern</author>
    <author loc="US">Per Bothner</author>
    <author loc="US">Kurt Cagle</author>
    <author loc="US">James Linn</author>
    <author loc="US">Vaidyanathan Nagarajan</author>
  </book>
  <book>
    <title lang="en" year="2003">Learning XML</title>
    <price>39.95</price>
    <author loc="US">Erik T. Ray</author>
  </book>
</bookstore>

See Also