Pass boolean value to a .Net Extension object - xslt

Question

I have the following XSL:
<xsl:variable name="PriorityCall">
<xsl:choose>
<xsl:when test="$PriorityFlag = 1 or $PriorityFlag = 2 or $PriorityFlag =3">
<xsl:value-of select="true()"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="false()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
and I want to pass the value of PriorityCall into a .Net Extension Object as follows:
<xsl:value-of select="UCInterface:InsertNewGroup($UserRef, $SiteCode, $PriorityCall)" />
Signature of the .Net method:
public string InsertNewGroup(string userRef, string siteCode, bool prioritySite)
the value in .Net is always true. However I can pass false if I call the extension method like this:
<xsl:value-of select="UCInterface:InsertNewGroup($UserRef, $SiteCode, false())" />
How can I pass a bool value by getting the value out of $PriorityCall?

Answer 1

Define the variable as <xsl:variable name="PriorityCall" select="$PriorityFlag = 1 or $PriorityFlag = 2 or $PriorityFlag =3"/>.
With your current setup your variable is (in XSLT 1.0) of type result tree fragment, a result tree fragment which contains a single, non empty text node which happens to contain the representation of a boolean value. But that will always be converted to true. If you simply use the select attribute with a boolean XPath expression, as shown above, then the value is of type boolean.