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An ItemDef describes a type of item that can occur within a study. Item properties include name, datatype, range, or codelist restrictions, and several other properties.
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The DataType attribute specifies the allowable values and the intended use of the corresponding value elements, but not necessarily how systems will store them. The receiver is expected to preserve the value and precision of the data and can use the ODM-specified datatype to determine the best representation of the data in their system.
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