code: public Extensions create(String tableName, String geometryColumnName,
  			String idColumnName) {
  
  		Extensions extension = getOrCreate(tableName, geometryColumnName);
  
  		createAllFunctions();
  		createRTreeIndex(tableName, geometryColumnName);
  		loadRTreeIndex(tableName, geometryColumnName, idColumnName);
  		createAllTriggers(tableName, geometryColumnName, idColumnName);
  
  		return extension;
  	}
docs: Create the RTree Index extension for the feature table, geometry column,
  and id column. Creates the SQL functions, loads the tree, and creates the
  triggers.
  
  @param tableName
  table name
  @param geometryColumnName
  geometry column name
  @param idColumnName
  id column name
  @return extension