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Predicate rdf_where/1
Availability::- use_module(library(semweb/rdf11)).
Source[semidet]{}(+Where)
[semidet]rdf_where(+Where)
Formulate constraints on RDF terms, notably literals. These are intended to be used as illustrated below. RDF constraints are pure: they may be placed before, after or inside a graph pattern and, provided the code contains no commit operations (!, ->), the semantics of the goal remains the same. Preferably, constraints are placed before the graph pattern as they often help the RDF database to exploit its literal indexes. In the example below, the database can choose between using the subject and/or predicate hash or the ordered literal table. 
    { Date >= "2000-01-01"^^xsd:date },
    rdf(S, P, Date)

The following constraints are currently defined:

> , >=,==,=<,<
The comparison operators are defined between numbers (of any recognised type), typed literals of the same type and langStrings of the same language.
prefix(String, Pattern)
substring(String, Pattern)
word(String, Pattern)
like(String, Pattern)
icase(String, Pattern)
Text matching operators that act on both typed literals and langStrings.
lang_matches(Term, Pattern)
Demands a full RDF term (Text@Lang) or a plain Lang term to match the language pattern Pattern.

The predicates rdf_where/1 and {}/1 are identical. The rdf_where/1 variant is provided to avoid ambiguity in applications where {}/1 is used for other purposes. Note that it is also possible to write rdf11:{...}.

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Jacco said (2018-06-11T12:40:43):0 upvotes 0 0 downvotes
Picture of user Jacco.

These query terms are documented (a bit) in the literal query options documentation of the old rdf_db:rdf/3 predicate.

Jan, should those docs be move here with a pointer for backward compat?

It would also help to include some examples showing that "String" is supposed to be a variable later used as the third argument to rdf11:rdf/3, and "Pattern" is typically some instantiated string or atom with the pattern to be searched.

Chris Mungall said (2018-06-11T03:48:29):0 upvotes 0 0 downvotes
Picture of user Chris Mungall.

I can't find any documentation on the semantics of terms using predicates such as like/2, word/2, etc.

It appears that like(String,Pattern) will allow a search term with '*' as wildcard.