In this example you'll be OK, because the value you're supplying is an
element, presumably an untyped element because you haven't run it past a
schema. If the element E is <E>123</E>, then (E castable as xs:integer) will
be true, and <xsl:variable name="X" as="xs:integer" select="E"/> will
succeed. But if someone (perhaps you) finds your function in three years
time and tries to call it as bib:number-condense("1", end), it will fall
over at run time with a type error. It's better to document the function's
expectations by putting "as" attributes on the xsl:param elements.
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Bruce D'Arcus [mailto:bdarcus(_at_)myrealbox(_dot_)com]
Sent: 14 December 2004 14:48
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] number collapsing
On Dec 14, 2004, at 9:41 AM, David Carlisle wrote:
Not sure if by "fail" you mean the <xsl:when test tests as
false or you
get a type error reported. And also not sure if by "an integer" you
mean
a value of that type in the xpath type system or something
that looks
like an intger, eg "123".
I'm not sure either :-)
Here's an example template:
<xsl:template match="mods:extent[(_at_)unit='page']">
<xsl:param name="prefix"/>
<xsl:param name="suffix"/>
<xsl:value-of select="$prefix"/>
<span class="pages">
<xsl:text> pp. </xsl:text>
<xsl:value-of select="mods:start"/>
<xsl:if test="mods:end">
<xsl:text>-</xsl:text>
<xsl:value-of
select="bib:number-condense(mods:start,mods:end)"/>
</xsl:if>
</span>
<xsl:value-of select="$suffix"/>
</xsl:template>
.... and the original function:
<xsl:function name="bib:number-condense">
<xsl:param name="begin"/>
<xsl:param name="end"/>
<xsl:choose>
<xsl:when test="$begin castable as xs:integer">
<xsl:variable name="begin" select="$begin" as="xs:integer"/>
<xsl:choose>
<xsl:when test="$begin gt 100 and $begin mod 100
and $begin
idiv 100 eq $end idiv 100">
<xsl:value-of select="$end mod 100"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$end"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$end"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
It has not failed yet (as in, Saxon never stops in its tracks with a
type error, and it formats the page ranges as I expect them to be
formatted), but it's not been widely tested.
Bruce
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