embedding xsd/xslt in XML

I want to include the xsd scheme of my xml in the document itself, like in
the ado xml-recordset. (ex: http://www.vbxml.com/xsl/articles/xsl_ado/) In
xml spy it doesn’t validate, the error is that he can't find the scheme. Is
there something wrong with my XML, or is it just xml spy?

I have the same problem with including xslt in xml , it has something to do
that I have to include the following dtd???
<!DOCTYPE doc [<!ATTLIST xsl:stylesheet id ID #REQUIRED >]>

This is my document:

<xml xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="#CMODataSchema">
<xsd:schema id="CMODataSchema">
            <xsd:element name="myComposite">
                        <xsd:complexType mixed="true">
                                    <xsd:sequence>
                                                <xsd:element name="myDouble"
type="xsd:double"/>
                                                <xsd:element name="myFloat"
type="xsd:float"/>
                                                <xsd:element name="myString"
type="xsd:string"/>
                                                <xsd:element
name="subComposite">
                                                            <xsd:complexType
mixed="true">

<xsd:sequence>

<xsd:element name="myDate" type="xsd:date"/>

<xsd:element name="myFloat" type="xsd:float"/>

<xsd:element name="myString" type="xsd:string"/>

</xsd:sequence>

</xsd:complexType>
                                                </xsd:element>
                                    </xsd:sequence>
                        </xsd:complexType>
            </xsd:element>
</xsd:schema>
<myComposite>
            <myDouble>45454.444</myDouble>
            <myFloat>5.4454546E16</myFloat>
            <myString>Ikke</myString>
            <subComposite>
                        <myDate>2002-01-01</myDate>
                        <myFloat>5.4454546E16</myFloat>
                        <myString>Ikke</myString>
            </subComposite>
</myComposite>
</xml>