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The file conforms to the 5.1.1 Basic Reference Set Member File Format and include one or more additional columns, The number and order of the columns and their basic data types are specified by the <pattern> which precedes Refset.

The <pattern> consists of a sequence of lowercase letters each of which represent an additional column with a datatype specified by the letter as listed below

Pattern letter

• cRefset : A refset with one additional column containing a component identifier. This pattern supports refset types including: 5.2.1.3 Attribute Value Reference Set, 5.2.4 2.1 Language Reference Set and 5.2.1.4 Association Reference Set).
• ciRefset : A refset with two additional columns, one containing a component identifier and one containing an integer. This pattern supports refset types including: 5.2.1.5 Ordered Association Reference Set.
• sRefset : A refset with one additional column containing a string. This pattern supports refset types including:  5.2.3.1 Simple Map from SNOMED CT Reference Set, 5.2.3.2 Simple Map to SNOMED CT Reference Set and 5.2.1.6 DEPRECATED: Annotation Reference Set.