ECMAScript for XML

This article is about a retired standard for XML inside JavaScript. For React's JSX, see JavaScript XML.

ECMAScript for XML (E4X) was an extension to ECMAScript (which includes ActionScript, JavaScript, and JScript) to add native support for Extensible Markup Language (XML).[1] The goal was to provide a simpler alternative to the Document Object Model (DOM) interface for accessing XML documents. E4X added XML as a primitive data structure to allow faster and easier access to XML manipulation and better support within the language.

E4X was standardized by Ecma International in the ECMA-357 standard. The first edition was published in June 2004 and the second edition in December 2005. However, the E4X standard was deprecated by the Mozilla Foundation in 2014,[2] and it was withdrawn by ISO/IEC in 2021.[1]

The first implementation of E4X was designed by Terry Lucas and John Schneider and appeared in BEA's Weblogic Workshop 7.0, released in February 2003 [3]. BEA's implementation was based on Rhino and released before the ECMAScript E4X spec was completed in June 2004.[citation needed]

Browser support

E4X was supported by SpiderMonkey (used in Firefox and Thunderbird). However, E4X was deprecated in Firefox 10[4] and eventually removed in Firefox 21.[5][clarification needed]

E4X was supported by the OpenOffice.org software suite.[citation needed]

Example

let sales = <sales vendor="John">
    <item type="peas" price="4" quantity="6"/>
    <item type="carrot" price="3" quantity="10"/>
    <item type="chips" price="5" quantity="3"/>
</sales>;

alert(sales.item.(@type == "carrot").@quantity);
alert(sales.@vendor);
for each(let price in sales..@price) {
    alert(price);
}
delete sales.item[0];
sales.item += <item type="oranges" price="4"/>;
sales.item.(@type == "oranges").@quantity = 4;

See also

  • JavaScript XML (JSX) – an XML based markup specifically for DOM manipulation

References

  1. ^ a b "ISO/IEC 22537:2006 Information technology – ECMAscript for XML: E4X specification". International Organization for Standardization. Retrieved 2024-08-17.
  2. ^ "E4X – Archive of obsolete content – MDN". Mozilla. Archived from the original on 24 July 2014. Retrieved 10 September 2014.
  3. ^ A version of the BEA website deep down the IT security firm "Adaptavist".'s domain, contains "A PDF of the release notes of BEA Workshop 7.0" (PDF). Archived from the original (PDF) on July 19, 2026.
  4. ^ "Firefox 10 for developers". Mozilla. Archived from the original on 5 May 2012. Retrieved 21 May 2012.
  5. ^ "E4X". Mozilla. Archived from the original on 30 September 2013. Retrieved 12 February 2013.

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