Mulgara

The following is accepted by mulgara:
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&nbsp;&nbsp;create &lt;<a href="local:///foo#m1&gt;;">local:///foo#m1&amp;gt;;</a>
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&nbsp;&nbsp;create &lt;<a href="local:///foo#m1">local:///foo#m1</a>&gt; &lt;<a href="http://mulgara.org/mulgara#XMLSchemaModel&gt;;">http://mulgara.org/mulgara#XMLSchemaModel&amp;gt;;</a>
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This then results in a partially unusable database, as this
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error cannot be corrected anymore. E.g.
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&nbsp;&nbsp;drop &lt;<a href="local:///foo#m1&gt;;">local:///foo#m1&amp;gt;;</a>
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produces the error
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&nbsp;&nbsp;Error resolving [$s $p $o $_from] from <a href="local:///foo#m1">local:///foo#m1</a>
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&nbsp;&nbsp;Model 287 has more than one type!
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It would be more robust if the 'create' checked that the model type
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is the same in the case where the model already exists.
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