WG: Display attribute inside an xsl:for-each-group loo

Hi guys,

I'm stuck (once again ;) with an XSL problem and I hope someone knows
how to solve it. I'm looping through my XML structure which looks like

<root>
    <sub_A>
        <node_A myattr="33533"/>
        <node_B>textual content</node_B>
        <node_B/>
        <node_C/>
        <node_D>textual content</node_D>
        <node_D myattr="1234567"/>
        <node_D/>
    </sub_A>
    <sub_B>
    ...
    </sub_B>
</root>

using a xsl:for-each-group loop because I want to display groups of node
names with a single header. The result should look like

node_A
33533
node_B
textual content
node_C
node_D
textual content
1234567

As you can see contents are stored inside a text node or an attribute
which is called "myattr". My loop construct looks like:

1    <xsl:for-each-group select="/root/sub_A/*"
group-adjacent="node-name()">
2        <xsl:value-of select="name()"/>
3        <xsl:for-each select="current-group()">
4            <xsl:value-of select="text()" /><xsl:value-of
select="@myattr/text()" />
5        </xsl:for-each>
6    </xsl:for-each-group>

Line 4 is of special interest - thats where the contents should :) be
displayed. While <xsl:value-of select="text()" /> works fine,
<xsl:value-of select="@myattr/text()" /> produces an error in the
XSL-parser:

Warning: on line 65 of
file:/srv/www/htdocs/bka/./tmp/evaluations/42ba56a40e38d.xsl: The child
axis starting at an attribute() node will never select anything

I'm using Saxon-B 8.0 working on a XSLT 2.0 stylesheet. Hope anybody can
figure this out.

Best regards - many thanks for your help!
Clemens Prerovsky