SiteMesh Is it my ignorant ?

How many people know this stuff , ah, not easy to use ah , why were not previously heard ah ? How many people use this ah ?
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on two projects are done with this stuff, the simple point that provides the layout of the template , plus head plus tail plus left navigation etc.
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heard , it seems that a page layout of things. But never used
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in the internet under a project file has this member

I think a big advantage is that not every page written include head and footer of
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should be is a kind of afterthought .
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that he and Apache Tiles What is the difference http://tiles.apache.org/
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very good use ! Unified page layout simpler than the frameset , to replace the frameset. You can try ah
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http://www.yofogo.com/

This is Ningbo 's largest electricity supplier online store with sharing network

is sitemesh do with the layout . Tops and bottoms to use this .

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know , I feel it more structured pages easily .
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right, looked like pretty good introduction , but why did not how to use it, is there any drawbacks or am I ignorant of it .