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Add README section about querying with SPARQL.ex

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Marcel Otto 2018-09-19 00:30:37 +02:00
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README.md
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@ -601,6 +601,13 @@ iex> RDF.Graph.new({EX.S1, EX.p, [EX.O1, EX.O2]})
- `RDF.Dataset.graph` returns the graph of the dataset with the given name
#### Querying graphs with the SPARQL query language
The [SPARQL.ex] package allows you to execute SPARQL queries against RDF.ex data structures. It's still very limited at the moment. It just supports `SELECT` queries with basic graph pattern matching, filtering and projection and works on `RDF.Graph`s only. But even in this early, limited form it allows to express more powerful queries in a simpler way than with the plain `RDF.Graph` API.
See the [SPARQL.ex README](https://github.com/marcelotto/sparql-ex#sparqlex) for more information and some examples.
#### Deleting statements
Statements can be deleted in two slightly different ways. One way is to use the `delete` function of the resp. data structure. It accepts all the supported ways for specifying collections of statements supported by the resp. `add` counterparts and removes the found triples.