4. Defining Data Types : hg_dtln Routine—Provide Type and Length for Histogram Value
 
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hg_dtln Routine—Provide Type and Length for Histogram Value
The hg_dtln routine provides the data type and length for a histogram value for a given data type.
This routine builds a datavalue, dv_histogram, which describes the data type and length of the histogram value for the data type specified in the input dv_from. Place the address of this routine in the dtd_hg_dtln_addr field of the IIADD_DT_DFN structure. If the II_DT_NOHISTOGRAM attribute is present, then this routine is not necessary.