Computed Location Predicate

I have a most vexing problem. I am writing a transform to create a
sample document from a schema. For fun, I thought I would randomize the
selection of items from enumerated lists. With Saxon 6.5.2, I tried many
variations of the predicate before final success with the following bit
of the code, which is within a for-each selecting
"/xs:schema/xs:complexType[<pulls the target
complexType>]/xs:restriction".

            <xsl:variable name="elementValue">
                <xsl:choose>
                    <xsl:when test="xs:enumeration">
                        <xsl:variable name="enumPtr">
                            <xsl:value-of
select="string-length($allValues) mod count(xs:enumeration) + 1"/>
                        </xsl:variable>
                        <xsl:value-of
select="xs:enumeration[number($enumPtr)]/@value"/>
                    </xsl:when>
                        .
                        .
                        .
                </xsl:choose>
            </xsl:variable>
            <xsl:value-of select="$elementValue"/>

During the course of debugging, I used the the following without
success:

            <xsl:variable name="elementValue">
                <xsl:choose>
                    <xsl:when test="xs:enumeration">
                        <xsl:value-of
select="xs:enumeration[number(string-length($allValues) mod
count(xs:enumeration) + 1)]/@value"/>
                    </xsl:when>
                        . 
                        .
                        .
                </xsl:choose>
            </xsl:variable>
            <xsl:value-of select="$elementValue"/>

I understand that my problems with (many) earlier versions were due to
the processor's inability to distinguish the predicate as a number
rather than a non-number and therefore a boolean. But why does the
processor differentiate between casting a variable to a number, which
works, and casting an expression to a number, which does not work?

Any suggestions?



Richard Patchet
bTrade, Inc.
2324 Gateway Drive
Irving, TX 75063
972-5802981
www.bTrade.com

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