RE: New editor's draft of SSN-Extensions available

Issues on Github:


From: Cox, Simon (L&W, Clayton) <> 
Sent: Tuesday, November 19, 2019 3:40 AM
Cc: Ilkka Rinne <>; Kathi Schleidt
<>; Stephen Richard (
<>; 'Douglas Fils ('
<>; Siddeswara Guru <>; Nick Car
( <>;
Rob Atkinson <>
Subject: New editor's draft of SSN-Extensions available


Colleagues - 


A new 'Editor's Draft' of the SSN-EXT ontology is available at 

Compared with the last Public Working Draft there have been a substantial set of
changes to the ontology and the document, the most important of which are:

1.	The presentation within the document now starts with worked
examples, and then moves on to the vocabulary description
2.	Two additional 'convenience' properties :hasOriginalSample and
:isUltimateSampleOf to help relate a sample to the resources earlier in the
sample-prep chain, which are usually considered important for discovery and
3.	The SPARQL rules for finding the ultimate feature-of-interest and to
copy-down properties from a collection to its members have been streamlined
4.	There are tests for all the SPARQL
5.	There are RDF representations of all the examples
6.	I am proposing that these extensions be moved into the SOSA
namespace, rather than a new namespace


The last item might raise some eyebrows. This is a change from the PWD. My
thinking here is that these extensions should be rolled into the base
vocabulary in dues course, so it is better that they share the same
namespace. I tested out the ssn-ext vocabulary with a user group (TERN) who
are harmonizing ecology and biodiversity observations. It all worked very
well, but yet again one thing that always confuses new adopters is too many
namespaces! So anything we can do to relieve that is likely to help
adoption. Remember - all elements - whether experimental,
proposed or adopted, are in a single namespace. And as the SSN extensions
are packaged in a separate RDF _graph_ (RDF file) no-one has to load them if
they don't want to encounter them.  


I have a little extra work to do on the document, primarily in the
alignments section, but I think it is good enough for review now and I
welcome comments. If you have comments which can be expressed as discrete
issues, then please create a GitHub issue here: and tag it [ssn-ext]. Else kick off a
conversation on this email list. 


From a process point of view, I think the next step would be for this IG to
agree to release it as a new Public Working Draft, replacing the previous
one which was published a year ago and triggered some discussion, primarily
in GitHub issues. The goal is to get the document published as a W3C Note /
OGC Discussion Paper. 


Thanks for your comments. 




Simon J D Cox 

Research Scientist - Environmental Informatics

Team Leader - Environmental Information Infrastructure

 <> CSIRO Land and Water 


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Received on Monday, 9 December 2019 18:36:45 UTC