[tcs-lc] Hybrids
Roger Hyam
roger at hyam.net
Fri Apr 29 08:42:09 PDT 2005
Started a new thread on this expanding on Bob's point.
Bob said
---
There is a small gotcha that bit us once. The horticultural code, which
seems to be incorporated in ICBN by reference , is underspecified on the
use of the symbol for cross, which in print is sometimes rendered with
the "multiplication" sign, 0xD7 in unicode hex. Not only is this not in
the ISO Latin set, but it is unclear to me whether ICBN would treat the
same string using the ascii character "X" as an orthographic variant or
not in a printed environment and hence(?) in an electronic environment.
---
Currently the schema does not cover the ICNCP. We chopped some of the
existing bits out because they were heavily caveated and we intend to
put them back in for the next version (0.95.3) once they have been
sorted through. I will be putting something together next week for
comments but if people have suggestions for the minimum elements we
could add to give the maximum coverage of cultivated plants please speak up.
Hybrids in scientific names are interesting. In ICBN it is perfectly
possible for an author to publish a name as a hybrid and another author
to come along and revise it as not being a hybrid or as having different
parents. None of this affects nomenclature. One simply adds an X (or
whatever symbol) if one believes the taxon concept is of hybrid origin
the name remains unchanged.
Bearing this in mind the way the schema works at the moment is that the
NameObject has no notion of hybridisation. This is because a single
NameObject could be used by two different concepts one of which is a
hybrid and the other isn't.
TaxonConcepts do care about hybrids. They signify this by having 'is
hybrid child of' relationships with other TCs. They could also have an X
in their <Name> tag (or a multiplication sign as we are in unicode). A
user agent could also make sensible decisions on how to render a TC on
the basis of whether it has hybrid child relationship or not so in away
whether or not the instance document contains an X or multiplication
sign doesn't matter - the consumer of the file does what they think
appropriate with it.
There is an example of a hybrid genus marked up under the IPNI Genera
examples on the LinneanCoreExampleNames of the LC wiki. Here is a direct
link to the file:
http://biodiv.hyam.net/schemas/TCS_0.95.2/genera_ipni_01.xml
There are other examples in there as well so don't get confused!
Hope this all makes sense.
Roger
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Roger Hyam
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