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Provide a simple worked example for the MO Template Editor that shows how modular archetypes can be combined.

A fruity example

Archetypes may be combined into one template. The advantage of this is that archetype modules can be write once - use many times, in different report and user contexts. By way of example you may have the talked about top ten archetypes and a couple more that make up a fair chunk of the EHR content, and then choose to combine these in certain ways for certain situations. Thus a discharge summary could contain (at least) a current medication list, allergies and history of encounter; and the clinical coding department could receive an initial patient separation notice including a brief cut down history of encounter, while pharmacy could receive a list of added medications. So this example shows the use case of combined archetype modules that comprise sometimes just parts of the originating archetypes. We have heard this use case in several places now.

But let's start with a simple combination of archetypes into a Template. In this case - the apple archetype is joined with orange and mango archetypes and we will do some Gello enabled adding up of weight and cost.

Some necessary files are located in

  1. Create a new template in the template editor and call it 'CEN-Fruit.v1'
  2. Either create two new archetypes yourself in another instance of the editor application, modeled on the mango and orange archetypes in the downloaded zip file; or choose to just bring them premade into the new Fruit template. In this case go File -> Add Archetypes from File , and then navigate to where you have your latest version of the apple archetype located. Click to add. This places the apple archetype below the 'CEN-Fruit.v1' archetype on the LHS. Repeat for 'CEN-Orange.v1.xml' and for 'CEN-Mango.v1.xml' in that order.

  3. Open out the Definition for Fruit. Name the ENTRY 'Fruit' and adjust the atCode to at0000. To bring the other archetypes into the Fruit template, make three new CLUSTERs (by using Add Data Group after right clicking on items. Name them for the component fruits - Apples, Oranges, Mangoes. Add an ELEMENT under each of them (remember we really should have an items between the CLUSTER and the ELEMENT). This ELEMENT node will hold the archetypes.

  4. Make the datatypes for these ELEMENTs each to be mtArchetype. Unfold the ELEMENTs to show UseArchetypeData. Click on this and on the RHS type in the names of the archetypes being used in the template, namely 'CEN-Apple.v2', 'CEN-Orange.v1' and then 'CEN-Mango.v1'.

  5. Click on any of the nodes in the Fruit template and then on preview it. This is what you will see:

  6. Save your work as 'CEN-Fruit.v1'. This will change the uses 0 Archetype(s) in the LHS to Uses 3 Archetype(s)

  7. Now we will add some GELLO and some nodes that calculate the total cost and weight for the Fruit template. Make a CLUSTER in the Fruit template below the mangoes CLUSTER. Call it 'Grand totals for fruit'. Under this put two ELEMENTS named 'Total Fruit Cost' and 'Total Fruit weight'. Give 'Total Fruit Cost' two decimal places. Make their data types (at ADLMatchType on the RHS)  to be 'mtQuantity'. Make their units to be '$' and 'g'. (Go here if you can't remember how to do this). Add this GELLO to isCalculated for 'Total Fruit Cost':

    No Format
    Context CEN_Fruit_v1::ArchetypeRoot
    Let applesCost: PQ = template.Fruit.Apples.Apples.components->firstN(5)->last().value.oclAsType(PQ)
    Let orangesCost: PQ = template.Fruit.Oranges.Oranges.components->firstN(6)->last().value.oclAsType(PQ)
    Let mangoesCost: PQ = template.Fruit.Mangoes.Mangoes.components->firstN(5)->last().value.oclAsType(PQ)
    applesCost + orangesCost + mangoesCost

  8. Here's some code for 'Total Fruit Weight':

    No Format
    Context CEN_Fruit_v1::ArchetypeRoot
    Let applesWt: PQ = template.Fruit.Apples.Apples.components->firstN(4)->last().value.oclAsType(PQ)
    Let orangesWt: PQ = template.Fruit.Oranges.Oranges.components->firstN(5)->last().value.oclAsType(PQ)
    Let mangoesWt: PQ = template.Fruit.Mangoes.Mangoes.components->firstN(4)->last().value.oclAsType(PQ)
     applesWt + orangesWt + mangoesWt

  9. Test it in preview mode. What happens? It doesn't work (yet) as we need to set BubbleEventsUp to be 'True' for all the CLUSTER nodes in the Fruit template, as well as the ENTRY and any items nodes in the component archetypes (located below where we are working in the LHS; the tags for each being located at the top on the RHS.

  10. The code in 7 and 8 above makes use of the fact that templated archetypes in the MO editor present as Observations , with within a self-named class. These observations have a sequence of Observations as components for the elements / clusters in them. We are making use of a known number of these, but could also have selected on local at codesatcodes.

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