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DOI has wide applicability to all forms of intellectual content and can therefore be applied to all forms of related materials, such as articles, books, classroom exercises, supporting data, videos, electronic files, and so on.
DOI provides a basis for work now in progress to develop automated means of processing routine transactions such as document retrieval, clearinghouse payments, and licensing.
The DOI is being further developed to incorporate functionality which could enable the user to associate a function with the DOI.
In general, a DOI suffix should not be considered "derivable." Although some DOIs may be generated according to a formula or algorithm, it is preferable to look them up in CrossRef, as there is no guarantee that a generated DOI has been registered with CrossRef or that it will resolve.
DOI suffixes should be extensible, and the suffix nodes may be used for this purpose.
While a DOI may have been created and assigned prior to publication, it is extremely important for the reliability of the CrossRef resolution system that such pre-publication DOIs remain for internal use only, and that they are not displayed online or in print or distributed to secondary publishers prior to online availability of the content.
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