Document Update Markup Language
Web Design & Development Guide
Document Update Markup Language
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Document Update Markup Language (DUML) is an XML specification created by
Brian Kardell to enable server-side logic DOM manipulation outside the context
of conventional JavaScript functions.
DUML supports a simpler approach to
AJAX. With most
current approaches, DOM manipulation is accomplished through arbitrarily complex
client-side JavaScript. With the DUML approach, the browser makes a standard
AJAX call to the server. Then DOM manipulation instructions (such as appending
nodes, replacing nodes, etc.) are generated server-side as a DUML document,
delivered to the browser, and finally interpreted by a simple DUML interpreter
running on the web page.
This diagram illustrates the interaction between the web browser and
the web application, and the role that DUML plays.
The net effect is to move complex DOM manipulation logic out of the web page
(and out of any associated JavaScript files) and onto the server. This may be
desirable in cases where a development team wishes to put this sort of logic in
the hands of the software developers rather than having the web designers handle
this.
DUML itself is very simple, supporting a set of nine manipulations:
appendChild, insertBefore, insertAfter, replace, remove. replaceContent,
set-attribute, executeScript and queueScript. Since instructions map more or
less directly to universally supported methods, the interpreter is
correspondingly simple.
The DUML specification itself is generic and not tied directly to HTML based
applications and therefore can be used with any XML/DOM based
user interface language as long as the client supports a language in which
an interpreter can be implemented.
History
The name "DUML" originated with Kardell's son, who remarked that writing DOM
manipulation code using complicated client-side JavaScript was "dumb".
External links
Home | Up | JavaScript library | Smart client | Reverse Ajax | Document Update Markup Language | Comparison between AJAX and Flex
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