scanning a tree (again)

I am sorry for sending this question again but I didn't got the answer that
I need maybe because I didn't explained my self !
I need to run an xsl stylesheet on my xml tree that do the following :
on every node in my xml tree I have a tag named 'modified' that tells me if
the current node has been modified.
I need to hold a flag that will tell me if one of the nodes has been
modified !
this flag will be the attribute of the first tag in my result tree. does it
means that I need to check the source tree first
for all the <modified> tags and then run my xsl (if so how should I do it
? )
can you do something like this ?


<xsl:variable name="valueofFlag"> false </xsl:variable>


<xsl:template match="/">
	<head>
		<xsl:element name="menu">
			<xsl:attribute name="color">black</xsl:attribute>
			<xsl:apply-templates/>
			<xsl:attribute name="modified"> <xsl:copy-of select="$valueofFlag"/>
</xsl:attribute>
		</xsl:element>
 	</head>
</xsl:template>

<xsl:template match="//child">
	<xsl:choose>
	   <xsl:when test ="//*[@modified='true']"> <xsl:variable
name="valueofFlag"> true </xsl:variable>  </xsl:when>
	   <xsl:otherwise></xsl:otherwise>
	</xsl:choose>
</xsl:template>
	.
	.
	.
	.


this is example of my xml :


<?xml version="1.0"?>
<data_xml>
	  <list>
		<dynamic_menu_id>1003</dynamic_menu_id>
		<PARENT_ID>1003</PARENT_ID>
		<name>first child</name>
	      <position>1</position>
		<modified>true</modified>
		 <object>
		    <dynamic_menu_id>1004</dynamic_menu_id>
		    <object_name>Accounting</BUTTON_NAME>
		    <position>1</position>
        	     <modified/>
		 </object>
	  	 <object>
		    <dynamic_menu_id>1005</dynamic_menu_id>
		    <object_name>management</BUTTON_NAME>
		    <position>2</position>
        	     <modified/>
		 </object>
	  	 <object>
		    <dynamic_menu_id>1006</dynamic_menu_id>
		    <object_name>xxxx</BUTTON_NAME>
		    <position>3</position>
        	     <modified/>
		 </object>
	  	 <object>
		    <dynamic_menu_id>1007</dynamic_menu_id>
		    <object_name>yyy</BUTTON_NAME>
		    <position>4</position>
        	     <modified/>
		 </object>
	  </list>
</data_xml>









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