ECMAScript for 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 access[clarification needed ] 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 However, the E4X standard was deprecated by the Mozilla Foundation in 2014,[2] and it was withdrawn by ISO/IEC in 2021.[1]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 2002.[citation needed ] BEA's implementation was based on Rhino and released before the ECMAScript E4X spec was completed in June 2004.[citation needed ]
Browser support
[edit ]E4X is supported by Mozilla's Rhino, as well as by Tamarin, the JavaScript engine used in the Flash virtual machine.[citation needed ] However, it is unsupported by other common engines like Nitro (Safari), V8 (Google Chrome), Carakan (Opera), and Chakra (Internet Explorer).[3]
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
[edit ]letsales=<salesvendor="John"> <itemtype="peas"price="4"quantity="6"/> <itemtype="carrot"price="3"quantity="10"/> <itemtype="chips"price="5"quantity="3"/> </sales>; alert(sales.item.(@type=="carrot").@quantity); alert(sales.@vendor); foreach(letpriceinsales..@price){ alert(price); } deletesales.item[0]; sales.item+=<itemtype="oranges"price="4"/>; sales.item.(@type=="oranges").@quantity=4;
See also
[edit ]- JSX (JavaScript) – an XML based markup specifically for DOM manipulation
References
[edit ]- ^ a b "ISO/IEC 22537:2006 Information technology – ECMAscript for XML: E4X specification". International Organization for Standardization. Retrieved 2024年08月17日.
- ^ "E4X – Archive of obsolete content – MDN". Mozilla. Archived from the original on 24 July 2014. Retrieved 10 September 2014.
- ^ "Issue 30975: Implement E4X Support for scripts and extensions" . Retrieved 21 May 2012.
- ^ "Firefox 10 for developers". Mozilla. Archived from the original on 5 May 2012. Retrieved 21 May 2012.
- ^ "E4X". Mozilla. Archived from the original on 30 September 2013. Retrieved 12 February 2013.
External links
[edit ]- ECMA-357 (withdrawn first edition, second edition)
- E4X at faqts.com (or via WayBack Machine)
- Slides from 2005 E4X Presentation by Brendan Eich, Mozilla Chief Architect
- E4X at Mozilla Developer Center Archived 2008年04月19日 at the Wayback Machine
- Introducing E4X at xml.com: compares E4X and json
- Processing XML with E4X at Mozilla Developer Center
- E4X: Beginner to Advanced at Yahoo Developer Network
