org.eclipse.rdf4j.federated.algebra

## Interface VariableExpr

- 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 and Description
    --- | ---
    `List<String>` | `getFreeVars()`

- - ### Method Detail

    - #### getFreeVars

          List<String> getFreeVars()

      Returns:
        a list of free (i.e. unbound) variables in this expression

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