The PLCopen TC6 - XML specification has been published on the website as Version 0.99 â release for comments.The organization will include comments before generating a version 1.0. In order to do so, the date for comments has been set to October 1, 2004. The organization particularly asks users to give feedback. In similar fashion to the XML spec, the Motion Control Part 2 â Extensions has been released as version 0.99 â release for comments. and hopes to include comments before generating a version 1.0. The date for comments also has been set to October 1, 2004.