[xep-support] xpath functions

[G. Ken Holman]

At 2009-08-21 09:37 -0700, Dmitry Beransky wrote:
>We are migrating our document generation solution from Excel into
>FO/RenderX.  Many of Excel functions are not supported by RenderX's
>XPath (e.g.  round(<dec_number>, <precision>),  max()).

That isn't a problem with RenderX in any way ... there is no 2-arity 
round() function in XPath 1 or 2.  There is a 2-arity 
round-half-to-even(num,precision) function and both a 1-arity and a 
2-arity max() function in XPath 2.

>What are my options?

Write your XML to XSL-FO transformation using XSLT 2 instead of XSLT 
1, then render the resulting XSL-FO using RenderX without XSLT 
transformation.  I believe the RenderX tool is shipped with only an 
XSLT 1 processor.

>Can I write my own function extensions and if so, how?

XSLT 2 supports user-defined functions but XSLT 1 does not.

There is a free excerpt on our web site of each of the XSLT book and 
the XSL-FO book that we sell.  The excerpt does not go into detail of 
writing user functions in XSLT 2, but the excerpt does talk to the 
data flow that distinguishes the XSLT processor responsibilities from 
the XSL-FO processor responsibilities.

I hope this helps.

. . . . . . . . . . . . . . . Ken


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