question: @ Nullable public static Block loadOneBlockFromXml ( String xml , BlockFactory blockFactory ) throws BlocklyParserException { List < Block > result = new ArrayList < > ( ) ; loadBlocksFromXml ( null , xml , blockFactory , null , result ) ; if ( result . isEmpty ( ) ) { return null ; } return result . get ( 0 ) ; }
target:  Convenience function to load only one Block.