The value of ENTITY must match an unparsed entity name declaration in a notation element in the schema.
<!-- schema -->
<xsd:notation name="jpg" public="image/jpg"
system="JPG_viewer.exe"/>
<xsd:complexType name="entityref">
<xsd:sequence>
<xsd:element name="picture">
<xsd:complexType>
<xsd:complexContent>
<xsd:extension base="xsd:anyType">
<xsd:attribute name="image"type="xsd:ENTITY"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<!-- instance document -->
<picture image="jpg">Brochure</picture>
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