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SNOMED CT specifies a set of reference set types that follow specific patterns. However, different purposes and uses may impose different requirements. Therefore, flexibility is a core feature of the reference set mechanism. This flexibility is manifested by the fact that reference sets can be applied in ways that meet specific requirements; options include:
| Option | Description |
|---|---|
Create reference set based on existing pattern | Creating a simple reference set, an ordered reference set (or any other reference set) using the predefined pattern for this reference set type. Without modifying or constraining the structure of this pattern. |
Create reference set based on existing pattern, however constraining the datatypes of specific attributes | Create a reference set using a predefined pattern, however specializing the descriptor template, by creating a copy and replacing the |Attribute description| or |Attribute type| values with a subtype. |
Customize reference set by defining a new reference set pattern | Define a new reference set pattern based on new or existing reference set types, attributes, and attribute values. (Since you could use an existing type as a starting point.) |
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