Defining an index on a choice element

I need to do queries like

Let $docs := collection(“/db/SPASE”)
Let $type := “NumericalData”
Let $result := $docs/Spase/*[name() = $type]

Where $type may be the name of any one of many “choice” elements from the schema https://spase-group.org/data/schema/spase-2.5.0.xsd
…
   <xsd:complexType name="Spase">
      <xsd:sequence>
         <xsd:element name="Version" type="spase:Version" minOccurs="1" maxOccurs="1" />
         <xsd:choice minOccurs="1" maxOccurs="unbounded">
            <xsd:element name="Collection" type="spase:Collection" />
            <xsd:element name="Catalog" type="spase:Catalog" />
            <xsd:element name="DisplayData" type="spase:DisplayData" />
            <xsd:element name="NumericalData" type="spase:NumericalData" />
            <xsd:element name="Document" type="spase:Document" />
            <xsd:element name="Software" type="spase:Software" />
            <xsd:element name="Granule" type="spase:Granule" />
            <xsd:element name="Instrument" type="spase:Instrument" />
            <xsd:element name="Observatory" type="spase:Observatory" />
            <xsd:element name="Person" type="spase:Person" />
            <xsd:element name="Registry" type="spase:Registry" />
            <xsd:element name="Repository" type="spase:Repository" />
            <xsd:element name="Service" type="spase:Service" />
            <xsd:element name="Annotation" type="spase:Annotation" />
         </xsd:choice>
      </xsd:sequence>
         <xsd:attribute name="lang" type="xsd:string" default="en"/>
   </xsd:complexType>
…
As expected, this performs poorly without a range index.  But what is the qname of the choice?  Do I have to define an index for each choice?  That is, 14 range indexes for Collection, Catalog, ….  Thanks.

Bernie

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