Source Codes contains value lists of controlled vocabularies of terms (e.g., subject terms), codes (e.g., language codes), identifiers (e.g., standard identifiers), or for specific data formulation rules (e.g., RDA) or schemes (e.g., DDC).  The vocabularies, rules, and schemes are generally referred to as the source of the value data, and the source is identified in data formats in order to support interpretation of data values that come from these sources.  The Source Codes are presented as separate lists for different types of sources, for example, subject sources, classification sources, date scheme sources.

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