xsl create xmlns:xsi namespace and attribute

<exercises xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="mySchema.xsd">

<xsl:element name="excercises">
<xsl:attribute name="xmlns:xsi" namespace="http://www.w3.org/2001/XMLSchema-instance"/>

<excercises xp_0:xsi="" xmlns:xp_0="http://www.w3.org/2001/XMLSchema-instance">

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <xsl:output method="xml" indent="yes"/>

    <xsl:template match="@* | node()">
    	<xsl:apply-templates select="xml"></xsl:apply-templates>
    </xsl:template>

    <xsl:template match="xml">
    	<xsl:element name="exercises">
    		<xsl:attribute name="xsi:noNamespaceSchemaLocation">mySchema.xsd</xsl:attribute>
    		some value
    	</xsl:element>
    </xsl:template>
</xsl:stylesheet>

<exercises xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="mySchema.xsd">

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 exclude-result-prefixes="xsi">
    <xsl:output omit-xml-declaration="yes"/>
    <!--                                   -->
    <xsl:template match="/">
      <exercises  xsi:noNamespaceSchemaLocation="mySchema.xsd"/>
    </xsl:template>
</xsl:stylesheet>

<exercises xsi:noNamespaceSchemaLocation="mySchema.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />

<xsl:attribute name="xsi:noNamespaceSchemaLocation">
      <xsl:value-of select="'mySchema.xsd'"/>
    </xsl:attribute>