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What is an i-Model, and why can't I modify it?
An i-model is a self describing file format.
There are several benefits to using an i-model:
1 When viewing an i-model, you do not need to have the additionalapplications in order to view attributes contained within the i-model.2. In many cases the i-model is optimized for better performance whenopening and viewing the filePublishing a file to an i-model file format can only be published asread-only. Keep in mind that an i-model is to be used for informationexchange not modification aspects.
http://communities.bentley.com/products/w/products__wiki/i-model-faq.aspx