Can I add syntax coloring for my own data object/MIME type?

Apache NetBeans Wiki Index

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Yes, but it is not trivial. There is a tutorial on the subject: http://wiki.netbeans.org/How_to_create_support_for_a_new_language

Applies to: NetBeans 6.7 and later, but most concepts (not the exact APIs) have been available since 6.0