--- On Fri, 8/22/08, Muralidhar Y wrote:
> What is value stack?
The value stack is both a stack (where the current action is pushed, the object
of an iterator tag is pushed (on top of the action), etc.
It's also a context, though--it stores some named objects (like #session and
#attr) by default, and we can add our own (most easily via tags like
<s:set...>, <s:url...> etc.)
> exactly how to write OGNL?
The OGNL home [1] has a link to a user manual.
> Sometimes we use "%{}" notation, sometimes we use "${}" notation?
The only time you ever use "${}" notation for OGNL is in configuration, both
XML and annotations. That's a wart; it's unfortunate that it uses a different
escape sequence there (and actually messes me up a little bit as I'm fond of
code generation and used ${} a lot :/
In things like JSP pages "${}" is plain old JSP EL notation.
Dave
[1] OGNL home: http://www.ognl.org/
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