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If the identified Scheme Type is ‘Subject-based’,
element M37 SUBJECT shall be used.
If the identified Scheme Type is ‘Functional’,
element M50 FUNCTION shall be used.
If the identified Scheme Type is ‘Free Text’ only, the value of subelement M34 Scheme Name shall be ‘None’.
Agencies may designate more than one Scheme Type
where, for example, they use a combination of a functional or subject-based
scheme with free text.
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