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Fold all that up and the next level up is SNOMED CT. SNOMED CT is a large medical ontology looked after by IHTSDO.org. GELLO uses it especially for subsumption queries, with the "implies"method. We won't see this today but it is useful in the homework at the end ;-)
Above this is iso_21090_datatypes. If you look up the CD datatype in here you can see that is about coded values and that the implies method is understood by this datatype.
Ok lets go back to the middle workspace. Notice the editor puts the first line in for you. We are in a context of a GLIF Decision node.
Our first line of GELLO below this context statement will be:
1 + 1
Compile it (five buttons in from LHS top menu). All good, now run it (seven buttons in from LHS top menu). Can you see the result now in Results Explorer?
Because we have loaded test data we can see it and start to think about how we can get to the data we need for a decision as to whether the latest hemoglobin result (if it exists) is too low.
To just see what we have loaded, clear the 1 + 1 line and simply type vmr
Run that and unfold the result in Results Explorer. Can you see 24 Observations? have a look at the first one.