<A>
  <B name="b1" attr1="one" attr2="two"/>
  <B name="b2" attr1="three" attr2="four"/>
</A>

<A>
   <B name="b1" attr1="one" attr2="two"/>
   <B name="b2" attr1="blah" attr2="blah"/>
</A>

<xsl:template name="modified">
	<xsl:for-each select="//B">
		<xsl:variable name="cur_col" select="."/>
		<xsl:if test="@name = $doc2/B/@name">
			<xsl:for-each select="./@*">
				<xsl:if test="not(. = $old/@*)">
                                    <MyOption>
					<xsl:attribute name="name"><xsl:value-of select="$cur_col/@name"/></xsl:attribute>
					<xsl:attribute name="event"><xsl:text>modified</xsl:text></xsl:attribute>
			 	     </MyOption>
				</xsl:if>
			</xsl:for-each>
		</xsl:if>
	</xsl:for-each>
</xsl:template> 

<xsl:if test="not(. = $old/@*)">

<xsl:if test="not(. = $doc2/B/@*)">