basics of XPL,

Hi,

Could you guys give me a basic breif of xpl. where actually it is use and for what purpose. I gonethrough the orbeon docs but not able to understand  how xforms and xpl are linked.

And if i can run the xform(.xhtml) in orbeon than what is the need of .xpl ?? in which cases it is used ? And where this page flow controller come in picture.

It would be great if you can sketch a rough flow chart and send it to me.

Thanks in advance.


Manish Suriya
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Website: http://www.tcs.com
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Manish,

If you have gone through the docs,
http://www.orbeon.com/ops/doc/reference-xpl-pipelines
then let me make a few comments.

Orbeon Forms is several technologies that provide
XML storage and transformation available as a Java
Servlet.  Unlike say, JSP pages, the scripting
language throughout is XML.

On the server side, that requires a couple things.
One is to be able to reference XML resources and
make transformations on them.  This is what XPL
does. Go to this URL and that file and aggregate
them, then pass them through a transformation, etc.

Also, the server needs some way to control the
logic and this is what the Page Flow accomplishes.

On the client side, XForms within XHTML provides
a declarative interface.

So, you have several "tools" to help you write
an application.  Indeed, you could likely write a
fairly complex application with no XPL, although the
Page Flow controller is required to link a URL with
the XHTML+XForms page.

When you want to write REST style XML services, url
endpoints that return XML content, XPL gives you
the capability to script and chain queries, transformations
and aggregations.  So it is a unique and powerful tool.

But you are not required to use XPL unless you need to
evaluate url parameters or need session variables and
a few other common servlet application tasks.

HTH,
Hank


On Oct 20, 2008, at 6:45 AM, Manish Suriya wrote:
Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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