Altova Mailing List Archives

[xsl] behavior of boolean() when applied to an empty variable

From: Wolfhart Totschnig <wolfhart@---------.--->
To: xsl-list@-----.------------.---
Date: 7/12/2011 2:32:00 AM

The boolean() function behaves in a way I don't understand when given an 
empty variable as argument. I was hoping one of you could explain it to me.

Take the following two variables:

<xsl:variable name="empty1"></xsl:variable>

<xsl:variable name="empty2">
    <xsl:if test="false()">
        <xsl:value-of select=" 'some non-empty string' "/>

The value of both variables is the same, i.e. "", an empty string. 
However, boolean($empty1) returns "false" while boolean($empty2) returns 
"true". Why? I thought that the boolean function can be used to test 
whether a string is empty---that is, I thought that it would return 
"false" in both cases. What am I misunderstanding?


XSL-List info and archive:
To unsubscribe, go to:
or e-mail: <mailto:xsl-list-unsubscribe@l...>


These Archives are provided for informational purposes only and have been generated directly from the Altova mailing list archive system and are comprised of the lists set forth on Therefore, Altova does not warrant or guarantee the accuracy, reliability, completeness, usefulness, non-infringement of intellectual property rights, or quality of any content on the Altova Mailing List Archive(s), regardless of who originates that content. You expressly understand and agree that you bear all risks associated with using or relying on that content. Altova will not be liable or responsible in any way for any content posted including, but not limited to, any errors or omissions in content, or for any losses or damage of any kind incurred as a result of the use of or reliance on any content. This disclaimer and limitation on liability is in addition to the disclaimers and limitations contained in the Website Terms of Use and elsewhere on the site.