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from:http://www.googlemother.com/wpblogs/?p=7281
Prototype WTP 0.2 released,this release for Prototype 1.6.0

Eclipse WTP support javascript code content assistance,but does not
support prototype js.
prototypeWTP is a tool make Eclipse WTP support prototype js code
content assistance.
PDT(PHP Development Tools framework for the Eclipse platform) is based
on WTP,so the plug-in also support PDT.

prototypeWTP also support other tools based on WTP,such as MyEclipse