[DFDL-WG] How to specify type/subtype combos?

[Garriss Jr., James P.]

Content types come in pairs.  So while the type can be "text" and the subtype can be "pdf", the complete content type cannot be "text/pdf".  It can, however, be "text/html" or "application/pdf".

So in my DFDL it's not sufficient to specify enumerated lists for types and subtypes (as I have done below), I must also specify which types are allowed to go with which subtypes.

How would I do that, given this complexType?  TIA!

    <xsd:complexType name="MimeTypeType">
        <xsd:sequence dfdl:separator="/">
            <xsd:element name="Type" dfdl:initiator="">
                <xsd:annotation>
                    <xsd:appinfo source="http://www.ogf.org/dfdl/dfdl-1.0/">
                        <dfdl:assert test="{ dfdl:checkConstraints(.) }" message="The type must match one of the values on the enumerated list."/>
                    </xsd:appinfo>
                </xsd:annotation>
                <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                        <xsd:pattern
                            value="([a|A][p|P][p|P][l|L][i|I][c|C][a|A][t|T][i|I][o|O][n|N])|
                            ([m|M][u|U][l|L][t|T][i|I][p|P][a|A][r|R][t|T])|
                            ([m|M][e|E][s|S][s|S][a|A][g|G][e|E])|
                            ([t|T][e|E][x|X][t|T])"
                        />
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
            <xsd:element name="Subtype" dfdl:terminator="">
                <xsd:annotation>
                    <xsd:appinfo source="http://www.ogf.org/dfdl/dfdl-1.0/">
                        <dfdl:assert test="{ dfdl:checkConstraints(.) }" message="The subtype must match one of the values on the enumerated list."/>
                    </xsd:appinfo>
                </xsd:annotation>
                <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                        <xsd:pattern
                            value="([p|P][d|D][f|F])|
                            ([a|A][l|L][t|T][e|E][r|R][n|N][a|A][t|T][i|I][v|V][e|E])|
                            ([m|M][i|I][x|X][e|E][d|D])|
                            ([r|R][f|F][c|C]822)|
                            ([p|P][l|L][a|A][i|I][n|N])|
                            ([h|H][t|T][m|M][l|L])"
                        />
                    </xsd:restriction>
                </xsd:simpleType>
            </xsd:element>
        </xsd:sequence>
    </xsd:complexType>


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