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When editing a dtd file in 6.7, the right click context menu includes the options * Generate CSS... * Check DTD * Generate documentation These have all disappeared in 6.8RC1 and there is only * All DTD Actions which doesn't appear to do anything. This may be related to https://netbeans.org/bugzilla/show_bug.cgi?id=177653 which appears to be a similar problem for editing XML files.
This problem is no longer reproducible in 6.8 so it must have been fixed prior to that.