The Srophé Application provides a partial facet implementation of the EXPath facet specifications (http://expath.org/spec/facet).

Module: modules/lib/facets.xql

Example facet configuration file: facet-def.xml

    <facet-definition name="series" label="Series">
        <group-by>
            <sub-path>ancestor::tei:TEI/descendant::tei:seriesStmt/tei:title</sub-path>
        </group-by>
        <max-values show="5">10</max-values>
        <order-by direction="ascending">value</order-by>
    </facet-definition>

• The name attribute describes the name of the facet.
• Label will become the HTML label.
• group-by element specifies how the facet should behave, in this case the default facet function is used. To create a custom facet you would define it here in the function attribute. Example:<group-by function="facet:authors"> (There must then be a matching facet:authors() function in facet.xqm)
• The group-by/sub-path describes the relative XPath to the element to be faceted on. Make sure there is a range index (see creating indexes) for the element in this XPath, as it will effect facet performance.
• The max-values element sets how many results to show initially (@show) and the maximum number of results to show once expanded.
• The order-by element sets the order for the facet, count or value (alphabetical by value)

Range facets are useful to group together values, for example grouping dates by century.

  <facet-definition name="Century">
        <range type="xs:year">
            <bucket gt="1500-01-01" lt="1600-01-01" name="1500-1600" order='6'/>
            <bucket gt="1600-01-01" lt="1700-01-01" name="1600-1700" order='5'/>
            <bucket gt="1700-01-01" lt="1800-01-01" name="1700-1800" order='4'/>
            <bucket gt="1800-01-01" lt="1900-01-01" name="1800-1900" order='3'/>
            <bucket gt="1900-01-01" lt="2000-01-01" name="1900-2000" order='2'/>
            <bucket gt="2000-01-01" name="2000 +" order="1"/>
        </range>
        <group-by type="xs:date">
            <sub-path>/@syriaca-computed-start</sub-path>
        </group-by>
        <max-values show="5">40</max-values>
        <order-by direction="descending">order</order-by>
    </facet-definition>

XQuery functions for displaying facets on an HTML page via eXist-db templating:

app:display-facets($node as node(), $model as map(*), $collection as xs:string?, $facets as xs:string?)

To include on an HTML page:

<div data-template="app:display-facets"/>

A collection parameter may be included, in this case the XQuery will look for a configuration file in the specified home directory for that collection, as established by the repo-config.xml file.

<div data-template="app:display-facets" data-template-collection="places"/>

HTML facets display can be restyled in the resources/css/style.css.