<textbox id="b0030" role="alt1">
    <textbox-head>
        <title>XXXXXXXXXXXXXX</title>
 </textbox-head>
</textbox>

With Case 1 I get correct output

<textbox aid:pstyle="TE A title" id="b0030" role="alt1">
..............

With Case 2 output is :

<textbox aid:pstyle="" id="b0030" role="alt1">


Empty aid:pstyle=""

<xsl:template match="display/textbox/textbox-head/title">
<xsl:variable name="role_title"
select="parent::textbox-body/parent::textbox[@role]"/>

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/