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Well, a warning is a warning and this is a harmless one. I for one do not like seeing warning icons beside my XML files in Eclipse. I find them annoying.
To clear this warning message, go to Windows > Preferences > XML > XML Files > Validation.
There is an entry there under the group Validating files called No grammar specified. Change the dropdown value from Warning to Ignore.
Voila! No more warning message!
