SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

88 | SNOMED CT Release Format 1 (RF1) Guide July 2012
2. How long does it take to classify SNOMED CT in Protégé 4.1?
• That depends on the classifier and how fast your machine is. Both Snorocket and ELK are very fast,
and complete in well under 30 seconds (actual clock time) on an adequately configured machine.
3. How do I use the DL Query Tab in Protégé 4 to create post-coordinated expressions?
a. We recommend looking at the Protege OWL Tutorial
(http://www.co-ode.org/resources/tutorials/ProtegeOWLTutorial.pdf) for more information on using
Protege 4.1 to construct expressions. In the Protege world, post-coordinated expressions are referred
to as DL expressions.
b. In order to create post-coordinated expressions in the DL query tab, you are required to use the
Manchester syntax for the expressions. In order to understand the Manchester syntax, you will need
to read and work the examples in the Protege OWL tutorial.
4. What can I do once I have classified SNOMED CT in Protégé 4.1?
• That depends on what you intended to do with a classified version of SNOMED CT. Within Protege
4.1, you can do subsumption testing over arbitrary DL expressions using the 'DL query tab' among
other things. This feature might be used to implement subsumption testing over post-coordinated
expressions.
2.3.5.2.6.5. Machine specification
1. What are the minimum specifications of machines for viewing loading and viewing SNOMED CT in OWL?
• As a general rule, for reasonable performance, one would require a 64-bit machine, such as an Intel
Core 2 Duo, with clock speed of 2GHz or more and 4GB of RAM to load the OWL version of SNOMED
CT in Protégé.
• The actual memory requirements might actually be smaller depending on your machine. Users have
successfully loaded SNOMED CT on a 32-bit Mac OS X machine with 2GB RAM, and on a 32-bit Linux
(Ubuntu) machine with 3GB RAM. However, display and editing performance is usually considered
unacceptably slow when using these minimal configurations.
• Loading and visualizing the OWL version of SNOMED CT using alternate methods might have different
machine specifications.
2. What are the minimum specifications for classifying SNOMED CT?
• It is believed that one would require a 64-bit machine with an Intel Core 2 Duo processor (or better)
with 4GB of RAM to classify SNOMED CT using the classifiers bundled with Protégé 4. Users have
successfully classified SNOMED CT on a 32-bit Mac OS X machine with 2GB RAM, and on a 32-bit
Linux (Ubuntu) machine with 3GB of RAM.
2.3.5.2.6.6. Software
1. Can I bundle the OWL version of SNOMED CT in my open source software?
• SNOMED CT is licensed under the affiliate license described above. SNOMED CT or any derivatives
of SNOMED CT cannot be redistributed under any other license (including any form of open source
license).
2. Am I allowed to make extensions or modification to the OWL release of SNOMED CT and include it in my
software?
• SNOMED CT is licensed under the affiliate license described above. SNOMED CT or any derivatives
of SNOMED CT cannot be redistributed under any other license (including any form of open source
license).
3. What API can I use to programmatically access the OWL version of SNOMED CT?
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