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1. Copying Committed Datatypes with H5Ocopy

Committed datatypes can be a powerful feature in HDF5. They can be used to share a single datatype description among multiple datasets, to save space or ensure that the datatypes are truly identical, and to assign a name to that datatype within the HDF5 group structure. The object copy API, H5Ocopy, can be used to copy HDF5 objects from one file to another, including committed datatypes and objects that use them. However, problems can occur when a dataset using a committed datatype or an object with an attribute that uses a committed datatype is copied to another file with H5Ocopy.

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