code: package it.unibz.inf.ontop.dbschema;
  
  import it.unibz.inf.ontop.exception.InvalidQueryException;
  import it.unibz.inf.ontop.exception.MetadataExtractionException;
  
  public interface MetadataLookup {
  
      /**
       * Retrieves the data definition object based on its name.
       *
       * @param id
       * @throws MetadataExtractionException if the relation is not found
       */
      NamedRelationDefinition getRelation(RelationID id) throws MetadataExtractionException;
  
      RelationDefinition getBlackBoxView(String query) throws InvalidQueryException, MetadataExtractionException;
  
      QuotedIDFactory getQuotedIDFactory();
  }
  