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Re: Comparing possibly empty string sequences

Subject: Re: Comparing possibly empty string sequences
From: "G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 23 Mar 2010 15:57:01 +0100
Re:  Comparing possibly empty string sequences
Ouch! Of course I should have written:


and not select= as I was thinking about the constraints but typing out of habit. Too distracted today.

. . . . . . . . . . Ken

At 2010-03-23 15:51 +0100, G. Ken Holman wrote:
At 2010-03-23 15:47 +0100, Martynas Jusevicius wrote:
a question somewhat related to my previous one.
Say I have $classes, a sequence of classnames (strings), possibly empty.

Fine ... cardinality 0 to many.

Now I want to select elements which @class attribute contains any of
the classnames from $class:
h:*[@class/tokenize(., '\s+') = $break-classes)]

In other words, select elements where tokenized @class intersects with $class.

It works fine unless $classes is an empty sequence, in which case I
get an error:
"XTTE0570: An empty sequence is not allowed as the value of variable $classes"

That is a declaration problem, not an executon problem. You don't show your declaration for $classes, but I'm assuming the declaration does not accommodate a cardinality of zero.

If it is:

<xsl:variable name="classes" select="xsd:string+"...

... then change it to:

<xsl:variable name="classes" select="xsd:string*"...

I hope this helps.

. . . . . . . . . Ken

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