/**
  * Gets an individual feature from the store.
  *
  * @param oid
  *      Primary key (unique identifier) of the feature to get
  * @return
  *      Feature with the specified OID, or NULL if it does not exist
  */
 public abstract Feature getFeature(FeatureOID oid);
 /**
  * Retrieves a feature given its primary key.
  *
  * @param oid
  *      Primary key (unique uidentifier) of the feature to get.
  * @return
  *      Feature corresponding to the OID, or NULL if not found
  */
 public Feature getFeature(FeatureOID oid)
 {
     return store != null ? store.getFeature(oid) : null;
 }