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I notice that the MODS schema uses xsd:sequence to define the children
of the cartographics element:

        <xsd:sequence>
               <xsd:element name="scale" minOccurs="0" type="xsd:string"/>
               <xsd:element name="projection" minOccurs="0" type="xsd:string"/>
               <xsd:element name="coordinates" minOccurs="0"
maxOccurs="unbounded" type="xsd:string"/>
        </xsd:sequence>

However, an example of <cartographics> in the MODS User Guidelines
does not conform to the schema:

<subject>
  <cartographics>
    <coordinates>E 72--E 148/N 13--N 18</coordinates>
    <scale>1:22,000,000</scale>
    <projection>Conic proj</projection>
  </cartographics>
</subject>

so I wonder if the example is wrong or the Schema (xsd:all instead of
xsd:sequence)? Is there a strong reason why the children should occur
in a rigid order in this case?

Joe Altimus
Arizona State University Libraries