The content type denotes the type of content of the external document as defined by MIME standard. MIME (Multipurpose Internet Mail Extensions) is an Internet standard for describes message
    content types.
MIME messages can contain text, images, audio, video, and other application-specific data.
Official MIME info is provided by the Internet Engineering Task Force (IETF) in the following documents:

        RFC-822 Standard for ARPA Internet text messages
        RFC-2045 MIME Part 1: Format of Internet Message Bodies
        RFC-2046 MIME Part 2: Media Types
        RFC-2047 MIME Part 3: Header Extensions for Non-ASCII Text
        RFC-2048 MIME Part 4: Registration Procedures
        RFC-2049 MIME Part 5: Conformance Criteria and Examples

<xs:attribute name="contentType">
    <xs:annotation>
        <xs:documentation xml:lang="en">
            <p>The content type denotes the type of content of the external document as defined by MIME standard. MIME (Multipurpose Internet Mail Extensions) is an Internet standard for describes message
						content types.</p>
            <p>MIME messages can contain text, images, audio, video, and other application-specific data.</p>
            <p>Official MIME info is provided by the Internet Engineering Task Force (IETF) in the following documents:
						<ul><li>RFC-822 Standard for ARPA Internet text messages</li>
                    <li>RFC-2045 MIME Part 1: Format of Internet Message Bodies</li>
                    <li>RFC-2046 MIME Part 2: Media Types</li>
                    <li>RFC-2047 MIME Part 3: Header Extensions for Non-ASCII Text</li>
                    <li>RFC-2048 MIME Part 4: Registration Procedures</li>
                    <li>RFC-2049 MIME Part 5: Conformance Criteria and Examples</li>
                </ul>
            </p>
        </xs:documentation>
    </xs:annotation>
    <xs:simpleType>
        <xs:restriction base="xs:string">
            <xs:pattern value="\w+/\w+" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>