How can I do to clear a reference from schema in xml

How can I do to clear a reference from schema in XML?
Hi people!
I am trying to insert an attribute with a namespace, but this namespace is a
reference to schema in XML, and it isn't work.
This is my code:

<xsl:template match="CURRICULUM-VITAE">
<xsl:element name="CURRICULUM-VITAE"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsl:attribute name="xsi:schemaLocation"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">http://www.cnpq.br/200
2/XSD/lattes Caminho  do Schema + documento.xsd</xsl:attribute>
<xsl:apply-templates/>
</xsl:element>
</xsl:template>

And the out to transformation is OK, but if already exists a reference
either in XML.

My question is:

first,
How can I do to clear a reference from schema in XML?

last,
 How can I do to insert a reference a new schema on same XML?

thanks
Eder de Oliveira



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