Developing and Maintaining Intensional Refsets
Overview
Local sets are a new construct for the creation of sets of concepts, similar to reference sets, but do not exist within a released or published edition or extension of SNOMED
Creating Intensional Refset
To add an intensional refset follow these steps:
Log into the tool (https://refset.ihtsdotools.org)
Select the "Refset" tab
Click on the "Add Refset" button available under the "Available" accordion.
Fill out the "Add Refset" dialog and select "INTENSIONAL" as the Type. The Definition must be in the format of the ECL (Expression Constraint Language)
(e.g.) <<406455002 | Allergen class (substance) |See http://www.snomed.org/news-articles/expression-constraint-language for details about the ECL.
Resulting subset will appear as follows with refset members populated based on the provided defintion.
Editing an Intensional Refset Definition
To edit an intensional refset follow these steps:
Log into the tool (https://refset.ihtsdotools.org)
Select the "Refset" tab
Select the refset intended to be edited. Note that intensional refsets are indicated by the
symbol. On the right pane, the details of the refset are displayed, including the Definition editing which is pictured below.
The Definition editing sub-panel has four actions: editing the definition(s), optimizing the definition(s), exporting definitions and importing definitions.
Editing the Definition
Click on the pencil icon to bring up the "Definition Clauses" form
Adding Inclusions
Inclusions are added by clicking on the '+' icon at the far right of the Refset Members title (see above)
The Add Refset Member form will appear.
Click 'Add' next to the desired inclusion.
Inclusion members will then be indicated with the 'I' in a green box icon. Concepts that are already members are indicated with the 'M' in a blue box icon. Any exclusions are indicated with the 'X' in a red box icon.