New feature: basic Ajax suggestion for tags and implementation of Dojo toolkit

git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f

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+-------------------------------------------------------------------------------
+Project Name
+-------------------------------------------------------------------------------
+Version 0.6
+Release date: 01/31/2008
+-------------------------------------------------------------------------------
+Project state:
+experimental
+-------------------------------------------------------------------------------
+Credits
+	James Burke (jburke@dojotoolkit.org)
+-------------------------------------------------------------------------------
+Project description
+
+The XHR IFrame Proxy (xip) allows you to do cross-domain XMLHttpRequests (XHRs).
+It works by using two iframes, one your domain (xip_client.html), one on the 
+other domain (xip_server.html). They use fragment IDs in the iframe URLs to pass
+messages to each other. The xip.js file defines dojox.io.proxy.xip. This module
+intercepts XHR calls made by the Dojo XHR methods (dojo.xhr* methods). The module
+returns a facade object that acts like an XHR object. Once send is called on the
+facade, the facade's data is serialized, given to xip_client.html. xip_client.html
+then passes the serialized data to xip_server.html by changing xip_server.html's
+URL fragment ID (the #xxxx part of an URL). xip_server.html deserializes the
+message fragments, and does an XHR call, gets the response, and serializes the
+data. The serialized data is then passed back to xip_client.html by changing
+xip_client.html's fragment ID. Then the response is deserialized and used as
+the response inside the facade XHR object that was created by dojox.io.proxy.xip.
+-------------------------------------------------------------------------------
+Dependencies:
+
+xip.js: Dojo Core, dojox.data.dom
+xip_client.html: none
+xip_server.html: none (but see Additional Notes section)
+-------------------------------------------------------------------------------
+Documentation
+
+There is some documentation that applies to the Dojo 0.4.x version of these files:
+http://dojotoolkit.org/book/dojo-book-0-4/part-5-connecting-pieces/i-o/cross-domain-xmlhttprequest-using-iframe-proxy
+
+The general theory still applies to this code, but the specifics are different
+for the Dojo 0.9+ codebase. Doc updates hopefully after the basic code is ported.
+
+The current implementation destroys the iframes used for a request after the request
+completes. This seems to cause a memory leak, particularly in IE. So, it is not
+suited for doing polling cross-domain requests.
+-------------------------------------------------------------------------------
+Installation instructions
+
+Grab the following from the Dojox SVN Repository:
+http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/io/proxy/xip.js
+http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/io/proxy/xip_client.html
+
+Install into the following directory structure:
+/dojox/io/proxy/
+
+...which should be at the same level as your Dojo checkout.
+
+Grab the following from the Dojox SVN Repository:
+http://svn.dojotoolkit.org/var/src/dojo/dojox/trunk/io/proxy/xip_server.html
+
+and install it on the domain that you want to allow receiving cross-domain
+requests. Be sure to read the documentation, the Additional Notes below, and
+the in-file comments.
+-------------------------------------------------------------------------------
+Additional Notes
+
+xip_client.html and xip_server.html do not work right away. You need to uncomment
+out the script tags in the files. Additionally, xip_server.html requires a JS file,
+isAllowed.js, to be defined. See the notes in xip_server.html for more informaiton.
+
+XDOMAIN BUILD INSTRUCTIONS:
+The dojox.io.proxy module requires some setup to use with an xdomain build.
+The xip_client.html file has to be served from the same domain as your web page.
+It cannot be served from the domain that has the xdomain build. Download xip_client.html
+and install it on your server. Then set djConfig.xipClientUrl to the local path
+of xip_client.html (just use a path, not a whole URL, since it will be on the same
+domain as the page). The path to the file should be the path relative to the web
+page that is using dojox.io.proxy.
+
+
+
+