datafacer FieldsPostgis {
  service connectBase(text baseUrl, text baseName, text login, text passwd);
  service list[Centroid] getCentroids(text tableName);
  service list[Neighblink] computeNeighb(text tableName, real distance);
  service disconnectBase();
}

datafacer Centroid {
  service int getId();
  service setId(int id);
  service real getX();
  service real getY();
  service setX(real x);
  service setY(real y);
}

datafacer Neighblink {
  service setLeft(int idleft);
  service int getLeft();
  service setRight(int idright);
  service int getRight();
  service setCoef(real coef);
  service real getCoef();
}