Fwd: Some bugs in: date.add-duration.function.xsl

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Hello, I use your template that I found in:
http://www.exslt.org/date/functions/add-duration/date.add-duration.template.xsl.html

When I try to call the template in this peice of code:

<xsl:variable name="dur1" select="xs:duration('P0000Y00M00DT00H00M01S')"/>
<xsl:variable name="dur2" select="xs:duration('P0000Y00M00DT00H00M01S')"/>
<xsl:variable name="duration">
	<xsl:call-template name="date:add-duration">
		<xsl:with-param name="duration1" select="xs:string($dur1)"/>
		<xsl:with-param name="duration2" select="xs:string($dur2)"/>
	</xsl:call-template>
</xsl:variable>

I get error:
Arithmetic operator is not defined for arguments of types (xs:boolean,
xs:integer)

because
here: <xsl:variable name="mult1" select="(($du1-neg) * -2) + 1"/>
here: <xsl:variable name="mult2" select="(($du2-neg) * -2) + 1"/>
here: <xsl:variable name="m" select="$months * ((($months &gt;= 0) *
2) - 1)"/> and
here: <xsl:variable name="s" select="$seconds * ((($seconds &gt;= 0) *
2) - 1)"/>

you don't use xs:integer constructor for cast booleans values (such as
$du1-neg).
So for solve it I added integer constructors:
<xsl:variable name="mult1" select="(xs:integer($du1-neg) * -2) + 1"/>
<xsl:variable name="mult2" select="(xs:integer($du2-neg) * -2) + 1"/>
<xsl:variable name="m" select="$months * (xs:integer(($months &gt;= 0)
* 2) - 1)"/>
<xsl:variable name="s" select="$seconds * (xs:integer(($seconds &gt;=
0) * 2) - 1)"/>

Also, here:
<xsl:otherwise>P</xsl:otherwise>
the template returns "P" if duration is 0, but "P" isn't valid form of
xs:duration, so I changed it to:
<xsl:otherwise>P0000Y00M00DT00H00M00S</xsl:otherwise>

I believe that this code work of some XSLT processors, because
different processors has different level of exaction of the XSLT code.
I use: EditiX version 2010

Generally, you wrote very good and useful code. Thank you.