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Chris Dollin
Index: trunk/content/documentation/query/text-query.mdtext
===================================================================
--- trunk/content/documentation/query/text-query.mdtext (revision 1655891)
+++ trunk/content/documentation/query/text-query.mdtext (working copy)
@@ -417,4 +417,33 @@
</dependency>
adjusting the version <code>X.Y.Z</code> as necessary. This will automatically
-include a compatible version of Lucene and the Solr java client, but not Solr
server.
\ No newline at end of file
+include a compatible version of Lucene and the Solr java client, but not Solr
server.
+
+# Configuring Alternative TextDocProducers
+
+Common RDF use has one field, mapping a property to a text index field.
+To have multiple fields, useful to *eg* conjunctive query, requires
+writing and configuring an alternative 'TextDocProducer'.
+
+To configure a `TextDocProducer` `MyProducer` in a dataset assembly,
+use the property `textDocProducer`, eg:
+
+ <#ds-with-lucene> rdf:type text:TextDataset;
+ text:dataset <#ds> ;
+ text:index <#indexLucene> ;
+ text:textDocProducer <java:CLASSNAME> ;
+ .
+
+where CLASSNAME is the `TextDocProducer` class; it must have either
+a single-argument constructor of type `TextIndex`, or a two-argument
+constructor `(DatasetGraph, TextIndex)`. The `TextIndex` argument
+will be the configured text index, and the `DatasetGraph` argument
+will be the graph of the configured dataset.
+
+It is up to the writer of CLASSNAME to arrange that the `Document`s
+that it constructs have the required multiple fields. See the
+project https://github.com/epimorphics/ppd-text-index for an
+example.
+
+
+
