Actionscript:
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var userInfo:XML = <users>
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<user fname="joe" lname="smith" age="31" />
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<user fname="mildred" lname="calder" age="64" />
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<user fname="ben" lname="nathanson" age="20" />
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<user fname="james" lname="biuford" age="19" />
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<user fname="nick" lname="calhoun" age="45" />
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</users>;
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trace("Users over 20:\n");
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trace(userInfo.user.(@age> 20).toXMLString());
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trace("\nUsers with the name nick:\n");
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trace(userInfo.user.(@fname == "nick" ).toXMLString());
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// use regular expressions with e4x
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trace("\nUsers with name starting with j:\n");
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trace(userInfo.user.(/^j/.test(@fname)));
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/*
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outputs:
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Users over 20:
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<user fname="joe" lname="smith" age="31"/>
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<user fname="mildred" lname="calder" age="64"/>
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<user fname="nick" lname="calhoun" age="45"/>
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Users with the name nick:
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<user fname="nick" lname="calhoun" age="45"/>
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Users with name starting with j:
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<user fname="joe" lname="smith" age="31"/>
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<user fname="james" lname="biuford" age="19"/>
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*/
One of the nicest features of E4X is filtering. The above code shows a few simple examples ... the last example makes use of regular expressions -- I first read using regular expressions and E4X somewhere on http://www.darronschall.com/.
I usually prefer to use a database for any kind of info I'll be searching... but if you know you have a relatively small amount of data XML can be a fine way to go.