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Member filters provide the ability to filter the rows of a reference set, based on the value of specific fields in the reference set. These filters are specified inside double curly braces, and begin with the letter "M".

Member Field Filters

To apply a member filter to one or more reference sets, the fields of those reference sets are matched against specified criteria. Only reference set members whose field values match the given criteria will be included in the results.

For example, the following expression constraint will match all referencedComponentIds (i.e. SNOMED CT concept id) from the active 

	^ 447562003 |ICD-10 complex map reference set| {{ M mapTarget = "J45.9" }}

Please note that by default, a word-prefix-any-order match is performed. Therefore the following expression constraint will match on rows that have a mapTarget of "J45.0", "J45.1",..., "J45.8", "J45.9" etc.

	^ 447562003 |ICD-10 complex map reference set| {{ M mapTarget = "J45" }}

Alternatively, a wildcard search can be performed, to achieve similar results. For example, the expression constraint below will match on rows that have a mapTarget starting with "J45" followed by zero or more other characters (e.g. "J45.0", "J45.1",...,"J45.8", "J45.9")

	^ 447562003 |ICD-10 complex map reference set| {{ M mapTarget = wild:"J45*" }}

To achieve an exact string match, a wildcard search (without an '*') can be used. For example, the expression constraint below will match only rows that have a mapTarget of "J45.9".

	^ 447562003 |ICD-10 complex map reference set| {{ M mapTarget = wild:"J45.9" }}

For more information on wildcard and word-prefix-any-order searching, please refer to 6.8 Description Filters.

Multiple field constraints can be applied within a reference set member filter. For example, the following expression constraint will return the referencedComponentId from the 

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For additional ways of specifying queries over the historical association reference sets, please refer to 6.11 History Supplements.

Module Filter

Module filters enable an expression constraint to match on only those rows of a reference set that belong to a specified module. Module filters use the keyword "moduleId" with a concept reference that is

< 900000000000443000 |Module|

.

For example, the expression constraint below matches all members of the

^ 900000000000534007 |Module dependency reference set| {{ M moduleId = << 32570231000036109 |Australian maintained module| }}

Effective Time Filter

Effective time filters enable an expression constraint to match on only those rows of a reference set with an effectiveTime that matches the specified criteria.

For example, the following expression constraint matches all rows of the 

^ 816080008 |International Patient Summary| {{ M effectiveTime >= "20210731" }}

Active Filter

Active filters enable an expression constraint to match on only those members of a reference set with a matching active status. Reference set rows are either active (i.e. active = 1 or active = "true") or inactive (i.e. active = 0 or active = "false"). By default, only active members of a reference set are included in the substrate. 

For example, the following expression constraints returns the inactive members of the

^ 816080008 |International Patient Summary| {{ M active = 0 }}