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[xsl] Error: sequence of more than one item not allowed

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Of the two nearly parallel statements below, (2) raises the error: "Sequence of more than one item not allowed as the second operand of 'eq'."

(1) groups-by the attribute ($format) and (2) by all the not ($format) attributes found in <Formats>. My thinking was that in (2) the 'group-by' would return a current-group() resolved to a single attribute by the <xsl:for-each select"current()> statement, but if so, I am clearly addressing that single attribute incorrectly. On the other hand, no error is reported when in (2) the group-by="@*[not(name(.)=$format)] resolves to a single attribute. Can I specify the <xsl:if test="$item eq ???"/> to avoid this error in (2) and still test against all of the not($format) attributes?

Thanks,
Mark

(1)
<xsl:for-each-group select="../../Stamp/Formats" group-by="@*[name(.)=$format]">
<xsl:for-each select="current-group()">
<xsl:if test="$item eq @*[name(.)=$format]"> <!--No error -->

(2)
<xsl:for-each-group select="../../Stamp/Formats" group-by="@*[not(name(.)=$format)]">
<xsl:for-each select="current-group()">
<xsl:if test="$item eq @*[not(name(.)=$format)]"> <!-- Error -->

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