<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=""

I tried to display the value also and it gives me "EMPTY" in case second.

<xsl:text>{</xsl:text><xsl:value-of 
select="$boxtype"/><xsl:text>}</xsl:text> GIVES {}.