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The DOT file editor is a 'standard' Xtext editor, consequently it uses the costly Xtext index as can be seen by a major rebuild starting when a *.dot file edit is saved. The Xtext index should be disabled for *.dot files since who would use a *.dor faile as a souce file for a build?
I don't think is valid to state that the Xtext index is related to source files of a build only. It is used to establish links between different Xtext resources based on node names. As .dot files are - at least to my knowledge - self-contained it may nevertheless be valid to disable the index because of this.