01: /*
02: * Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2007.
03: *
04: * Licensed under the Aduna BSD-style license.
05: */
06: package org.openrdf.query.algebra;
07:
08: import java.util.Set;
09:
10: /**
11: * An expression that evaluates to RDF tuples.
12: */
13: public interface TupleExpr extends QueryModelNode {
14:
15: /**
16: * Gets the names of the bindings that are, or can be, returned by this tuple
17: * expression when it is evaluated.
18: *
19: * @return A set of binding names.
20: */
21: public Set<String> getBindingNames();
22:
23: public TupleExpr clone();
24: }
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