Enriching Rich Internet Applications with Rule-Based Reasoning

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I came across a Firefox Add-On today by Matthias Tylkowski, that lets user to modify the browser view of his/her preferred web pages. For example, user can modify the appearance of cnn.com to suit his/her needs.

The add-on or the web rules is a JSON-based rule language, where each rule is a JSON object. In addition, Javascript is used for method calls. The web rules use Drools-like condition language:

{
    "id":"rule101",  "appliesTo": [
              "http://www.cnn.com"],
               "condition":  "$X:Element( class == 'note', $Y:firstChild ) &&
                              ($Y.nodeName == 'ul')",
               "actions":[  "changeBackground($Y, 'blue')"   ]
}

For all elements of class note having as first child an ul, change the first child background color to blue.

I think its a quite cool add-on.

Resources:
JSON RuleS

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