# value set binding

## value set binding

A terminology binding that represents the set of permitted values that can be used to populate a coded data item.

#### Notes

* A *value set binding* can be defined using individual rules. For example concepts that are: in a list of included concept identifiers, members of a specified reference set or subtypes of a specified concept.
* Expression constraints provide a more flexible way to represent *value set bindings* as they are able to represent and combine a range of different rules to determine the set of concepts or expressions that are part of a *value set*.

#### Example

* The following *expression constraint* defines a *value set* that includes all concepts that represent a [387713003 | surgical procedure|](http://snomed.info/id/387713003) defined as using an [37270008 | endoscope|](http://snomed.info/id/37270008) for access.

<< [387713003 |Surgical procedure (procedure)|](http://snomed.info/id/387713003) :\
[425391005 |Using access device (attribute)|](http://snomed.info/id/425391005) = << [37270008 |Endoscope, device (physical object)|](http://snomed.info/id/37270008)

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