further group sequence problem

Hi

Further to group sequence problem(xsl for schema), Is
it possible to adjust the key setting, to let  
PET starts1 
MAID starts1 
PET ends1 
MAID ends1 
occur after name, before phone(in sequence)

thanks !!
Paul

======== schema =======
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
	<xs:element name="MSG">
		<xs:complexType>
			<xs:sequence>
				<xs:element ref="GRP"/>
				<xs:element ref="NAME"/>
				<xs:sequence minOccurs="0">
					<xs:element ref="PET"/>
					<xs:element ref="MAID"/>
				</xs:sequence>
				<xs:element ref="PHONE"/>
				<xs:element ref="E-MAIL"/>
			</xs:sequence>
		</xs:complexType>
	</xs:element>
</xs:schema>


====== style sheet =========
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
	<xsl:output method="html" indent="no"/>
	<xsl:key name="elements" match="xs:element"
use="generate-id((preceding-sibling::xs:element |
self::xs:element) [starts-with(@ref,
'GRP')][last()])"/>
	<xsl:key name="at" match="element" use="@name"/>
	<xsl:template match="xs:element" mode="group">
		<xsl:apply-templates select="." mode="start"/>
		<xsl:apply-templates select="." mode="end"/>
		<xsl:apply-templates select="key('elements',
generate-id())[generate-id() !=
generate-id(current())]" mode="start"/>
		<xsl:apply-templates select="key('elements',
generate-id())[generate-id() !=
generate-id(current())]" mode="end"/>
	</xsl:template>
	<xsl:template match="xs:element" mode="start">
		<xsl:value-of select="@ref"/>
		<xsl:text> starts1 &#10; </xsl:text>
	</xsl:template>
	<xsl:template match="xs:element" mode="end">
		<xsl:value-of select="@ref"/>
		<xsl:text> ends1 &#10;</xsl:text>
	</xsl:template>
	<xsl:template match="xs:sequence">
		<xsl:if test="ancestor::xs:element/@name='MSG'">
			<xsl:apply-templates select="key('elements', '')"
mode="start"/>
			<xsl:apply-templates select="key('elements', '')"
mode="end"/>
			<xsl:text>&#10;---11&#10;</xsl:text>
			<xsl:apply-templates
select="xs:element[starts-with(@ref, 'GRP')]"
mode="group"/>
		</xsl:if>
	</xsl:template>
</xsl:stylesheet>

==== end ====

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