OCD 6.x introduces a new style of tags (obviously XML inspired).

The old DAX tags (version 1) looked like this:

<!--[TagName]--><!--[/TagName]-->

The new DAX tags (version 2) look like this:

<dax:TagName></dax:TagName>

However, in order to use the new tags you must include the following declaration in the Declaration section (see Declaration tab in DaxEdit).

DAX_VERSION 2;

If this declaration is not present, you will receive a script error message.

OCD 6.0 beta 1 (build 9715) includes a theme with the new tags. Look for 'Default Theme.dax' in the Templates sub folder.