[auscope-geosciml] GeologicUnit/composition/CompositionPart/role vocabulary [SEC=UNCLASSIFIED]

Oliver.Raymond at ga.gov.au Oliver.Raymond at ga.gov.au
Wed Jan 26 16:55:02 EST 2011


Thanks Steve.  That explains everything.

Cheers, Ollie




________________________________
From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Stephen M Richard
Sent: Wednesday, 26 January 2011 3:04 AM
To: auscope-geosciml at lists.arcs.org.au
Subject: Re: [auscope-geosciml] GeologicUnit/composition/CompositionPart/role vocabulary [SEC=UNCLASSIFIED]

Ollie--
there were originally two vocabularies for the two part types, but there was so much overlap they got merged.

Here's the longish discussion from the vocabulary concept scheme header discussing this:


This file contains the 200811 version of CGI Geologic Unit Part role vocabulary. This vocabulary includes terms to specify the role of a geologic unit as part of another geologic unit, the role of a CompositionPart in a geologic unit. These terms may be used to populate GeologicUnit.part.GeologicUnitPart.role, and GeologicUnit.composition.CompositionPart.role. There are terms in This vocabulary that only apply to one or the other of these properties, but after an effort to create two separate vocabularies, it was decided to use a single vocabulary in order to avoid having the same concept in more than one closely related vocabulary. The duplication of applicable concepts in the two contexts (GeologicUnit.part.GeologicUnitPart.role and GeologicUnit.composition.CompositionPart.role) arises because the model allows representation of complex geologic unit descriptions in more than one way. A complex geologic unit like a migmatite complex or a lithologically heterogeneous Pennsylvanian cyclothem stratigraphic unit will have many different lithologic components. The simplest approach to representing the lithologic heterogeneity is to report a single GeologicUnit element with compositionParts for each lithologic component; the role on these compositionParts provides information about what kind of parts they are and perhaps something about their relationship, along with the kinds of rock they are composed of. A more complex alternate approach is to represent the various components each as GeologicUnit elements, each with compositionPart links to the rock type(s) composing that part. These component GeologicUnit elements are aggregated by GeologicUnit.part.GeologicUnitPart elements, with roles in the aggregation for each GeologicUnit part. The benefit of the more complex approach is that additional descriptive properties provided by the GeologicUnit content model can be assigned to each part, as well as GeologicRelations between the parts. The role of the compositionParts in these more 'disaggregated' GeologicUnit elements would be a simpler 'composition' kind of role, because the heterogeneous 'whole' unit would be described in GeologicUnitParts that are more lithologically homogeneous. Its a standard trade off between simplicity and expressiveness. As far as the vocabulary for these 'role' properties, the decision to merge the compositionPart.role and GeologicUnitPart.role vocabularies into one was based on the idea that from a user point of view, one would not want to have to use terms from two different vocabularies to search for the same concept. For instance, if one wanted 'all geologicUnits that have parts whose role is 'Tectonic block', a merged vocabulary allows construction of a single xpath where "role = 'CGI....:Tectonic_block'" (or something like that). The single vocabulary also simplifies maintenance. A context column is added in the spreadsheet to distinguish terms for 'compositionPart', 'geologicUnitPart' or 'both'.

steve

On 1/24/2011 7:17 PM, Oliver.Raymond at ga.gov.au<mailto:Oliver.Raymond at ga.gov.au> wrote:

Hi all,



Does anybody have a vocabulary that I could use for GeologicUnit/composition/CompositionPart/role for Testbed4?



We have a CGI vocabulary for CompoundMaterial-ConstituentPart-Role and for GeologicUnitPart-Role, but not for CompositionPart-Role.



There were various local vocabs referred to in Testbed3 instance docs (GSV, GSC, BGS, etc) for this attribute and it would be nice if we could wrap them up into a CGI vocab.



Cheers,

Ollie





______________________________________________________________________________________



Ollie Raymond



National Geological Maps and Data Standards Project

Geoscience Australia<blocked::http://www.ga.gov.au/minerals/research/national/nat_maps/nat_geol_maps.jsp>



Interoperability Working Group

IUGS Commission for the Management and Application of Geoscience Information

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Stephen M. Richard

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