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[xsl] Re: Any way to specify diagnostic message for missing stylesheet parameter?

2014-10-16 08:38:31
You're right, required attribute should be omitted. But default value of
xsl:param will report desired warning or error message.
--
VB

-----Original Message-----
From: David Sewell [mailto:dsewell(_at_)virginia(_dot_)edu] 
Sent: Thursday, October 16, 2014 4:14 PM
To: Vladimir Nesterovsky
Cc: 'xsl-list'
Subject: RE: Any way to specify diagnostic message for missing stylesheet
parameter?

The default parameter value is not possible when using <xsl:param
required="yes">. xsl:param must be empty in that case.

On Thu, 16 Oct 2014, Vladimir Nesterovsky wrote:

You can define a default value of parameter in a way to report omission:

<xsl:param name="somevar">
 <xsl:sequence select="'default'"/>
 <xsl:message select="somevar is not specified"/> </xsl:param>
--
VN

-----Original Message-----
From: David Sewell [mailto:dsewell(_at_)virginia(_dot_)edu]
Sent: Wednesday, October 15, 2014 7:19 PM
To: xsl-list
Subject: Any way to specify diagnostic message for missing stylesheet 
parameter?

Given a stylesheet parameter <xsl:param name="somevar" 
required="yes"/>, failing to supply a parameter value at run-time 
results in a boilerplate error message such as "XTDE0050: No value 
supplied for required parameter somevar".

It would be helpful to be able to supply a custom error message such 
as
"required: somevar=[true|false|unknown]" to save the user the time it 
takes to look through the code to figure out what parameter is 
expected. There's no way to do this in the XSLT spec through 3.0, 
correct? and no common extensions for doing it?

If not, would that be a useful feature for others, or are there 
reasons not to implement something like that as an extension or
enhancement?

David

--
David Sewell, Editorial and Technical Manager ROTUNDA, The University 
of Virginia Press PO Box 400314, Charlottesville, VA 22904-4314 USA
Email: dsewell(_at_)virginia(_dot_)edu   Tel: +1 434 924 9973
Web: http://rotunda.upress.virginia.edu/





--
David Sewell, Editorial and Technical Manager ROTUNDA, The University of
Virginia Press PO Box 400314, Charlottesville, VA 22904-4314 USA
Email: dsewell(_at_)virginia(_dot_)edu   Tel: +1 434 924 9973
Web: http://rotunda.upress.virginia.edu/

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