How can I validate a xml document with another namespace?

[song young bin]

--below is qe.xml------
<?xml version="1.0" encoding="UTF-8"?>
<book xmlns="http://mynamespace/"; 
xmlns:dc="http://purl.org/dc/elements/1.1/"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="http://mynamespace/
qe.xsd">
	<dc:title>
		<mainTitle>slum dunk</mainTitle>
		<subTitle>slum dunk</subTitle>
	</dc:title>
</book>

--below is qe.xsd------
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://mynamespace/"; 
xmlns="http://mynamespace/"; xmlns:xsd="http://www.w3.org/2001/XMLSchema"; 
xmlns:dc="http://purl.org/dc/elements/1.1/"; elementFormDefault="qualified">
	<xsd:element name="book" type="bookType"/>
	<xsd:complexType name="bookType" >
		<xsd:sequence>
			<xsd:element  name="dc:title"  type="titleType"/>
		</xsd:sequence>
	</xsd:complexType>
	<xsd:complexType name="titleType">
		<xsd:sequence>
			<xsd:element name="mainTitle" type="xsd:string"/>
			<xsd:element name="subTitle" type="xsd:string"/>
		</xsd:sequence>
	</xsd:complexType>
</xsd:schema>

qe.xml is a well formed document. but it is impossible to validate.
because qe.xsd have got the problem line
<xsd:element  name="dc:title"  type="titleType"/>
I know I wrote wrong line. but I have not other solutions.
any idea?
Thanks in advance.

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