VariableExpr (Eclipse RDF4J 4.2.4)

All Known Subinterfaces:

ExclusiveTupleExpr, ExclusiveTupleExprRenderer, FedXTupleExpr, StatementTupleExpr

All Known Implementing Classes:

CheckStatementPattern, ExclusiveArbitraryLengthPath, ExclusiveGroup, ExclusiveStatement, FedXStatementPattern, PassThroughTupleExpr, StatementSourcePattern
```
public interface VariableExpr
```
Interface for algebra nodes that can return the free variables of the expression.

Author:

Andreas Schwarte

See Also:

QueryAlgebraUtil.getFreeVars(org.eclipse.rdf4j.query.algebra.TupleExpr)

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  List<String> getFreeVars()

- Method Detail
  - getFreeVars
```
List<String> getFreeVars()
```
    Returns:
    
    a list of free (i.e. unbound) variables in this expression