Re: testing for a missing attribute

I'm trying to process an XML schema and produce some documentation. I'm trying to trap the various ways min/max occurs can be specified and give the typical option/required/repeating translation. min/maxOccurs are not required values and they default to 1 when not specified. I'm having troubles detecting this situation.

Here is what I've been trying, but it isn't working unless values are specified:

<xsl:choose>
        <xsl:when test="@minOccurs=0 and @maxOccurs=''"> optional

</xsl:when>
<xsl:when test="@minOccurs=nil and @maxOccurs=nil"> required
</xsl:when>
<xsl:when test="@minOccurs=1 and @maxOccurs=1"> required
</xsl:when>
<xsl:when test="@minOccurs=1 and @maxOccurs='unbounded'"> required repeating
</xsl:when>
<xsl:when test="@minOccurs='' and @maxOccurs='unbounded'"> required repeating
</xsl:when>
<xsl:otherwise> min:<xsl:value-of select="@minOccurs"/> max:<xsl:value-of select="@maxOccurs"/>
</xsl:otherwise>
</xsl:choose>

  <xsl:variable name="minOccurs" select="(@minOccurs,1)[1]"/>
  <xsl:variable name="maxOccurs" select="(@maxOccurs,1)[1]"/>

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