Unsure whether I need a group or a sort or something else - xslt-2.0

Question

Hi I am an occasional user of XSLT so am probably missing something obvious, but hopefully someone can point it out!
The original XML has the structure;
<test>
<input>a</input>
<input>b</input>
<input>c</input>
<input>d</input>
<input>e</input>
</test>
The XSL file contains the following processing commands;
<xsl:template name="convertInputToNumeric">
<xsl:param name="inputs" />
<xsl:for-each select="input">
<NumericCode>
<xsl:call-template name="toNumericCode">
<xsl:with-param name="type">Input</xsl:with-param>
<xsl:with-param name="" select="." />
</xsl:call-template>
</NumericCode>
</xsl:for-each>
</xsl:template>
the call template 'toNumericCode' takes the current input and looks up in another xml file a numeric representation for the input eg the input 'a' returns the value '001'
<Conversion type="Input">
<Convert>
<FROM>a</FROM>
<TO>001</TO>
</Convert>
<Convert>
<FROM>b</FROM>
<TO>002</TO>
</Convert>
<Convert>
<FROM>c</FROM>
<TO>001</TO>
</Convert>
<Convert>
<FROM>d</FROM>
<TO>001</TO>
</Convert>
<Convert>
<FROM>e</FROM>
<TO>002</TO>
</Convert>
</Conversion>
so running the XSL I currently get
<test>
<NumericCode>001</NumericCode>
<NumericCode>002</NumericCode>
<NumericCode>001</NumericCode>
<NumericCode>001</NumericCode>
<NumericCode>002</NumericCode>
</test>
but actually what I want is that I only get the distinct nodes eg
<test>
<NumericCode>001</NumericCode>
<NumericCode>002</NumericCode>
</test>
I don't know how best to do this as I would want to group based on the numeric code value that is returned from the template 'toNumericCode' rather than the initial input value?

Answer 1

You may use distinct-values(). Have look, I have change your shared template with this one:
<xsl:template name="convertInputToNumeric">
<xsl:param name="inputs" />
<xsl:parm name="abc"><xsl:for-each select="input">
<NumericCode>
<xsl:call-template name="toNumericCode">
<xsl:with-param name="type">Input</xsl:with-param>
<xsl:with-param name="" select="." />
</xsl:call-template>
</NumericCode>
</xsl:for-each>
</xsl:parm>
<xsl:for-each select="distinct-values($abc/NumericCode)">
<NumericCode><xsl:value-of select="."/></NumericCode>
</xsl:for-each>
</xsl:template>
output:
<NumericCode>001</NumericCode><NumericCode>002</NumericCode>