The added /1 to the xmlns:fx largely breaks integration with all versions of NetBeans.

The version information
specified in https://javafx-jira.kenai.com/browse/RT-28599
  and
implemented in https://javafx-jira.kenai.com/browse/DTL-5739

Causes the following anomalies, reported in the NetBeans' Bugzilla:

236624 [74cat] After "Make Controller" project builds cleanly, but won't run or debug
236621 [74cat] FXML editor - Errors are incorrectly highlighted
236620 [74cat] Make Controller fails to inject Private variables (control fx:id )
236559 Using Netbeans "Make Controller" duplicates the fx:controller property, and makes the fxml file non-loadable anymore
236508 NullPointerException: The description parameter cannot be null