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// This example runs a query.
using System;
using System.IO;
using SemWeb;
using SemWeb.Query;
public class Example {
public static void Main(string[] argv) {
if (argv.Length < 3) {
Console.WriteLine("Usage: query.exe format queryfile datafile");
return;
}
string format = argv[0];
string queryfile = argv[1];
string datafile = argv[2];
Query query;
if (format == "rsquary") {
// Create a simple-entailment "RSquary" query
// from the N3 file.
query = new GraphMatch(new N3Reader(queryfile));
} else {
// Create a SPARQL query by reading the file's
// contents.
query = new SparqlEngine(new StreamReader(queryfile));
}
// Load the data file from disk
MemoryStore data = new MemoryStore();
data.Import(new N3Reader(datafile));
// First, print results in SPARQL XML Results format...
// Create a result sink where results are written to.
QueryResultSink sink = new SparqlXmlQuerySink(Console.Out);
// Run the query.
query.Run(data, sink);
// Second, print the results via our own custom QueryResultSink...
query.Run(data, new PrintQuerySink());
}
public class PrintQuerySink : QueryResultSink {
public override bool Add(VariableBindings result) {
foreach (Variable var in result.Variables) {
if (var.LocalName != null && result[var] != null) {
Console.WriteLine(var.LocalName + " ==> " + result[var].ToString());
}
Console.WriteLine();
}
return true;
}
}
}
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