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This talk concerns the production of open charm in diffractive deep inelasticscattering. This has been calculated recently in the context of thesemi-classical approach to diffraction. A comparison is made to approaches inwhich the diffractive exchange is modelled by the exchange of two gluons in the$t$-channel. Two phenomenological test of the underlying partonic process arediscussed.Comment: 6 pages, latex, 5 figures. Talk given at the diffractive working  group of DIS '97, Chicago Il. The required AIP style files are provide

Is charm the key to understanding diffraction in DIS?