Re: Defining an index on a choice element

Hi Bernie,

Yes, if you're using range indexes you need to define them one index per
element/attribute qname. For a somewhat more flexible approach, you might
be able to use facets and/or fields - see
https://exist-db.org/exist/apps/doc/lucene#facets-and-fields.

Joe

On Tue, Nov 15, 2022 at 7:28 AM Harris, Bernard T. (GSFC-5870) via
Exist-open <[email protected]> wrote:

> 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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>

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