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Re: How to check if a value is numeric and add 2500 to

Subject: Re: How to check if a value is numeric and add 2500 to it?
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 05 Apr 2010 08:06:19 -0400
Re:  How to check if a value is numeric and add 2500 to
At 2010-04-05 14:01 +0200, Ben Stover wrote:
Assume I have a XML doc which might contain an optional tag with a numeric value similar to


Now I want to check with a XSLT expression:
- if this optional <ns1:aaa> tag exists at all

You address it with a node set expression and if the result is non-empty, then it exists.

If you are using XSLT 1 and you are at the parent of the element then:

<xsl:if test="ns1:aaa">

A more explicit way in XSLT 2 would be:

<xsl:if test="exists(ns1:aaa)">

... but the result is the same.

- if it exists then it should be checked if the value is numeric (leading and trainling blanks should be ignored. integer and floating numbers should both be

If you are using XSLT 1 then:

<xsl:if test="number(ns1:aaa) = number(ns1:aaa)">

... because of the property of NaN not being equal to NaN.

A more explicit way in XSLT 2 would be:

<xsl:if test="ns1:aaa castable as xsd:float">

- If the value is numeric then 2500 (resp. 2500.00) should be added

<xsl:value-of select="ns1:aaa + 2500"/>

How can I implement this logic in XSLT?

<xsl:if test="exists(ns1:aaa)"> <xsl:if test="ns1:aaa castable as xsd:float"> <xsl:value-of select="ns1:aaa + 2500"/> </xsl:if> </xsl:if>

I hope this helps.

. . . . . . . . . Ken

-- XSLT/XQuery training: San Carlos, California 2010-04-26/30 Principles of XSLT for XQuery Writers: San Francisco,CA 2010-05-03 XSLT/XQuery training: Ottawa, Canada 2010-05-10/14 XSLT/XQuery/UBL/Code List training: Trondheim,Norway 2010-06-02/11 Vote for your XML training: http://www.CraneSoftwrights.com/s/i/ Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/ G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/s/bc Legal business disclaimers: http://www.CraneSoftwrights.com/legal

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