how to do a dynamic boolean checking in xslt - xslt

Question

From my root template for unique account value, call goes to trans template were in the input xml I will have multiple nodes, my requirement is that once the call goes from root template to trans template, if a match of accountId found in between multiple elements, account details template is called only once, irrespective of other match found. I need a solution for above requirement.
input sample :
<elements><accountId>1</accountId></elements>
<elements><accountId>1</accountId></elements>
<elements><accountId>2</accountId></elements>
<elements><accountId>2</accountId></elements>
<elements><accountId>3</accountId></elements>
The below line should be wrapped under some code so its called only once
<xsl:call-template name="Account_details" />
Below is my complete code for xsl
<xsl:template match="/">
<xsl:variable name="unique-accounts" select="//*/*/*/accountId/text()[generate-id()=generate-id(key('account-by-id', .)[1])]"/>
<xsl:for-each select="$unique-accounts">
<xsl:variable name="currentValue" select="current()"/>
<xsl:apply-templates select="//trans">
<xsl:with-param name="passCurrentValue" select="$currentValue"/>
</xsl:apply-templates>
</xsl:for-each>
</xsl:template>
<xsl:template match="trans">
<xsl:param name="passCurrentValue" />
<xsl:variable name="booleanValue" select="true()"/>
<xsl:for-each select="elements">
<xsl:if test="$passCurrentValue=/*/*/accountId">
<xsl:if test="$booleanValue">
<xsl:call-template name="Account_details" />
<xsl:variable name="booleanValue" select="false()"></xsl:variable>
</xsl:if>
</xsl:for-each>
</xsl:template>
<xsl:template name="Account_details">
.............
</xsl:template>

Answer 1

With the code
<xsl:template match="/">
<xsl:variable name="booleanCheck" select="true"></xsl:variable>
the variable booleanCheck is a node-set (XSLT 1.0) or sequence of elements named true below the document node /. So unless your XML input has a root element named true the value is an empty node-set respectively empty sequence. If you want to select a boolean value then use <xsl:variable name="booleanValue" select="true()"/>. See http://www.w3.org/TR/xpath/#function-true. Then you can test <xsl:if test="$booleanValue">. That should explain how to use boolean values, whether that fits into your context I am not sure.