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Subject: RE: [plcs-tog] Publication of reference data
I don’t see a problem with anything
that was proposed and I will take that as input to the requirements for PLCS
Maintenance Data. Each set of reference data will be its own
entity. For example, 15926 will have its own set and PLCS will have its own
set. Formats and requirements may be different for each standard (AP239 and
15926-4). The Maintenance Agency must support multiple formats to meet the
requirements of different standards and parts. However, there should be a
format consistency within each standard or part. I don’t think we want
to mix apples and oranges under the same standard/part. Thus, all PLCS reference data should
conform to the same format. There may be different formats and requirements
for 15926-3 and 15926-4. However, since PLCS is one standard, AP239, in my
opinion, all the reference data should be in the same format. If anyone has a
different requirement, please advise. We should be able to publish it in as many
parts or pieces as we like, i.e. defense, automotive, aircraft, etc. as long as
each part/piece is uniquely identified and unambiguous. Each part (set of
reference data) would be maintained separately under the PLCS area of the
Maintenance Agency. The customer can pick and choose the set or sets of
reference data they would like to use. Please advise if this approach will meet
PLCS requirements. Thanks. From: Rob Bodington
[mailto:rob.bodington@eurostep.com] Tim I believe that there is
only one maintenance agency proposed – I think that makes sense. Does anyone in the TOG
have a view? Can we put forward this
position to the SC4 meeting as the PLCS position? Responses needed ASAP as
the meeting is ongoing this week. Regards -----Original Message----- I think this sounds like
the best approach. The maintenance agency
has to be sufficient for at least these two cases, if not more to cover other
SC4 projects/initiatives. Hence it will need to support a number of
formats. However, it is not clear
to me (at least) if it is the intention to have a single agency,
or to allow for an multiple agencies - e.g. an
agency specifically for each one, which would then sit under (so to speak)
the SC4 agency. Also, how extensive is this list of formats? Can anyone comment
on this? Cheers, Tim From: Rob
Bodington [mailto:rob.bodington@eurostep.com] Hi To avoid any confusion
.... ... I am not suggesting that
PLCS uses ISO 15926 for reference data (I don't think that Trine is either). At
this stage PLCS is using OWL for reference data. The PLCS EXPRESS has been
converted to OWL and the PLCS reference data is specified as classes that are
subclasses of the PLCS EXPRESS/OWL classes. The intent is to continue
with this approach. The requirement is therefore
that the maintenance agency: 1) allows the registration of the PLCS OWL files as
reference data 2) does not enforce all reference data to be ISO
15926 (at some stage in the future, the PLCS reference data might be converted
to ISO 15926 - but not at this stage) 3) allows multiple sets of reference data to be
registered. In other words there is no requirement to have all reference data
in one file/repository. We may have one set of reference data for Defence, one
for commercial aircraft (these are just made up examples) Regards -----Original Message----- Hi. I fully agree with Rob's
statements. My
understanding from previous TOG meetings is that we (TOG) will
support the SC4 Maintenance Agency work and are positive to use ISO15926 if (or
when) the standard provide practical guidelines that is useful for DEX
reference data needs. My understanding is also
that TOG is positive to assess the use or need for the Reference Data
System (RDS) that is under development (for support of development, management
and maintenence of reference data classes in ISO15926. Configuration management
included). Best regards Trine From: Rob
Bodington [mailto:rob.bodington@eurostep.com] Hi I understand that there will be some discussion about
establishing a maintenance agency for SC4 reference data at the next SC4
meeting. I think it would be useful for the TOG to agree a
PLCS position on this that can be put forward by which ever PLCS TOG member
will be at the meeting. My
view is: 1)
PLCS intends to develop and publish reference data as a
standard. 2)
PLCS recognizes that a number of industries and projects
will develop extensions to the standard reference data for their own purposes.
This does not need to be made into a normative standard. 3)
PLCS intends to make the standard reference data freely
available. This includes the development, standardization, publication and
subsequent use of the reference data. 4)
PLCS intends to use a standardization organization that
supports this model. Currently, OASIS bests fits this. 5)
If ISO change their approach to allow pojnt 3), then PLCS
will standardize the reference data though SC4 and the maintenance agency. Obviously there are other issues in terms of the
business model to support the maintenance and development of the reference
data. I don't have an answer to that. But I am believe that charging people to
use reference data will not provide sufficient funding and will add another
barrier to the take up of the standard. As I said, this is my opinion. What does everyone
else think? Can the TOG agree a position on this and can someone who is
attending the meeting present it? I also believe that we should continue to put
pressure on ISO to allow the SC4 standards to be freely available - but that is
another topic J Regards -------------------------------------------
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