effecient inline multi-conditional testing

Dear <xsl-list:gurus/>,


here's the task:
  -create a template to cast an overloaded boolean value

here's the psuedo-template:
	<xsl:template name="cast:boolean">
		<xsl:param name="b-value">
			<!-- overloaded boolean value;  
				some potential values may be:
					1.  'true' or 'false' or 't' or 'f'
					2.  'yes' or 'no' or 'y' or 'n'
					3.  '1' or '0'
					4.  ...
			  -->				
		</xsl:param>
		<xsl:param name="cast">
			<!-- 'casting' operator;  
				some potential values may be:
					1.  'true-false' or 't-f'
					2.  'yes-no' or 'y-n'
					3.  '1-0'
					4.  ...
			  -->
		</xsl:param>
		<xsl:if test="$operand">
			<xsl:if
test="(($b-value='1')or($b-value='0')or($b-value='true')or($b-value='false')
or($b-value='yes')or($b-value='no') ... )">
				<xsl:choose>
					<xsl:when
test="('true-false'=$cast)">
						<!-- ... -->

					</xsl:when>
					<xsl:when test="('yes-no'=$cast)">
						<!-- ... -->

					</xsl:when>
					<xsl:otherwise>
						<!-- ... -->
					</xsl:otherwise>

				</xsl:choose>
			</xsl:if>
		</xsl:if>
	</xsl:template>

my question is this:
Any ideas on a more effecient way to conduct the second (xsl:if) test than
the way I'm about to?

Maybe some stylesheet scoped param that acts like a mask and then use the
translate(...) function?  Or, ...?

If there is a FAQ on this, then I apologize ... I looked and couldn't find
one.

Thanks,
Jeff

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