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<div class="moz-cite-prefix">Hi Thomas,<br>
<br>
Thanks for this feedback.<br>
<br>
I am growing in favor of using a simple URN for all the "famous"
(well known units).<br>
<br>
Hence, we might have in the reference section of a P21 e3 file:<br>
<br>
#10=<urn:iso:metre>;<br>
#20=<urn:iso:inch>;<br>
#30=<urn:iso:centigrade>;<br>
#40=<urn:iso:Fahrenheit>;<br>
#50=<urn:iso:furlong> ;<br>
#60=<urn:iso:inches-per-second>;<br>
<br>
And so on for all the units that the standards want to recognize.
There would not need to be any files to define these units (but
there could be). Software systems would be expected to "know" them
from the URN and that would include knowing how to convert between
them. <br>
<br>
(Without benefit of a conversion based expression - oh my gosh
what will happen if there is an apocalypse and the only people
left are idiot savant nerds who only know how to follow
mathematical expressions and cannot remember any units except the
ones stored in the NIST library which was the only building in
Washington to survive the catastrophe of course) - Yes I will be
made to regret this statement.<br>
<br>
Martin<br>
<br>
<br>
On 6/10/2014 9:29 AM, Thomas Liebich wrote:<br>
</div>
<blockquote cite="mid:53970820.1070109@aec3.de" type="cite">
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Dear all,<br>
<br>
only as a side remark. During our IFC (ISO16739) developments we
faced the same issue - a derived unit involving factor and offset
cannot be defined with the current conversion_based_unit.<br>
<br>
So we added a subtype to IFC4, which essentially defines the same,
as the proposed extension here for P41.<br>
See
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.buildingsmart-tech.org/ifc/IFC4/final/html/link/ifcconversionbasedunitwithoffset.htm">http://www.buildingsmart-tech.org/ifc/IFC4/final/html/link/ifcconversionbasedunitwithoffset.htm</a><br>
<br>
One important consideration: you need to determine, whether to
apply the offset before or after applying the factor. We decided
to apply it after.<br>
<br>
hope it gives another insight,<br>
<br>
regards<br>
Thomas<br>
<br>
-- <br>
<br>
<div class="moz-cite-prefix">Am 08.06.2014 01:46, schrieb thomas
thurman:<br>
</div>
<blockquote
cite="mid:32FA2F17-028E-4248-9EAD-65924A44EA2B@imonmail.com"
type="cite">
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charset=ISO-8859-1">
Addendum for Fahrenheit discussion.
<div>
<div>Comments on current approach in part 41 and AP 214:<br>
<div>
<div>
<div>1-part 41 is specific that any unit that is related
to a unit specified in part 41 shall be a
‘conversion_based_unit’.</div>
<div>2-conversion_based_unit only converts the magnitude
but does not provide an offset.</div>
<div>3-The use of ISO 13584-20 for such a simple case is
long agreed overkill; the example in part 41 F 4.4 has
EXPRESS</div>
<div>errors (</div>
<div>a-the expression_conversion_based_unit shall be a
conversion_based_unit (see (1) above.) and</div>
<div>b-the attribute redeclaration in e.g.,
named_unit_variable.associated_variable_environment is
invalid.).</div>
<div>4-AP 242 ed1 did not include a structure to support
Fahrenheit unit exchange.</div>
<div>5-AP214 used a context_dependent_unit which is
invalid (see (1) above). As noted above this was NOT
promoted to</div>
<div>AP 242.</div>
<div>6-After several attempts to discover a URL,URN for
Fahrenheit I gave up and am proposing that SC4 define
its own</div>
<div>(NIST has a guide that includes a definition of
Fahrenheit as a note (I think) but does not provide a
URN or URL.).</div>
<div>(There are multiple conversion calculators on the
web but I am not convinced of their persistence.</div>
<div>In any event use of a conversion calculator opens
up its own can of worms.)</div>
<div><br>
</div>
<div>==========proposed solution:===========</div>
<div><br>
</div>
<div>add a subtype of conversion_based_unit,
conversion_based_unit_with_offset to provide the
offset.</div>
<div><br>
</div>
<div>=========current:============</div>
<div><br>
</div>
<div><span style="font-family: Times; font-size:
medium;">A </span><b style="font-family: Times;
font-size: medium;">conversion_based_unit</b><span
style="font-family: Times; font-size: medium;"> is a
type of </span><a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.named_unit"
style="font-family: Times; font-size: medium;"><b>named_unit</b></a><span
style="font-family: Times; font-size: medium;"> that
defines a unit on the basis of a </span><a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit"
style="font-family: Times; font-size: medium;"><b>measure_with_unit</b></a><span
style="font-family: Times; font-size: medium;">.</span>
<p class="note" style="font-family: Times; font-size:
medium;"><small><a moz-do-not-send="true"
name="note_">NOTE </a> The <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit.value_component"><b>value_component</b></a> attribute
of the <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit"><b>measure_with_unit</b></a> defines
the conversion factor.</small></p>
<p class="example" style="font-family: Times;
font-size: medium;"><small><a moz-do-not-send="true"
name="example_">EXAMPLE </a> An inch is a <b>conversion_based_unit</b>.
It is from the Imperial system, its name is
"inch", and it can be related to the <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.si_unit"><b>si_unit</b></a>,
millimetre, through a <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit"><b>measure_with_unit</b></a> whose
value is 25.4 millimetre. A foot is also a <b>conversion_based_unit</b>.
It is from the Imperial system, its name is
"foot", and it can be related to an <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.si_unit"><b>si_unit</b></a>,
millimetre, either directly or through the unit
called "inch".</small></p>
<div style="font-family: Times; font-size: medium;"><u>EXPRESS
specification:</u></div>
<p style="font-family: Times; font-size: medium;"><code>*)<br>
ENTITY conversion_based_unit<br>
SUBTYPE OF (<a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resource_docs/fundamentals_of_product_description_and_support/sys/18_schema.htm#measure_schema.named_unit">named_unit</a>);<br>
name : <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resource_docs/fundamentals_of_product_description_and_support/sys/25_schema.htm#support_resource_schema.label">label</a>;<br>
conversion_factor : <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resource_docs/fundamentals_of_product_description_and_support/sys/18_schema.htm#measure_schema.measure_with_unit">measure_with_unit</a>;<br>
WHERE<br>
WR1: SELF\named_unit.dimensions =
derive_dimensional_exponents(conversion_factor\measure_with_unit.unit_component);<br>
END_ENTITY;<br>
(*</code></p>
<p style="font-family: Times; font-size: medium;"><u>Attribute
definitions:</u></p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><b><a
moz-do-not-send="true"
name="measure_schema.conversion_based_unit.name">name: </a></b>the <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/support_resource_schema/support_resource_schema.htm#support_resource_schema.label"><b>label</b></a> by
which the <b>conversion_based_unit</b> is known.</p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><b><a
moz-do-not-send="true"
name="measure_schema.conversion_based_unit.conversion_factor">conversion_factor: </a></b>the <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit"><b>measure_with_unit</b></a> that
specifies the physical quantity from which the <b>conversion_based_unit</b> is
derived.</p>
<p style="font-family: Times; font-size: medium;"><u>Formal
propositions:</u></p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><b><a
moz-do-not-send="true"
name="measure_schema.conversion_based_unit.wr:wr1">WR1: </a></b>The
dimensional exponents shall be equal to those from
the <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.conversion_based_unit.conversion_factor"><b>conversion_factor</b></a>.</p>
<div><br>
</div>
</div>
<div>=========proposed addition to part 41=========</div>
<div><span style="font-family: Times; font-size:
medium;">A </span><b style="font-family: Times;
font-size: medium;">conversion_based_unit_with_offset</b><span
style="font-family: Times; font-size: medium;"> is a
type of </span><b style="font-family: Times;
font-size: medium;">conversion_based_unit</b><span
style="font-family: Times; font-size: medium;"> that
includes a scale offset</span><span
style="font-family: Times; font-size: medium;">.</span></div>
<div>
<p class="note" style="font-family: Times; font-size:
medium;"><a moz-do-not-send="true" name="example_">EXAMPLE </a>
A Fahrenheit is a <b>conversion_based_unit_with_offset</b>.
It is from the Imperial system, its name is
“fahrenheit", and it can be related to the <a
moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.si_unit"><b>si_unit</b></a>,
degree Celsius, through a <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resources/measure_schema/measure_schema.htm#measure_schema.measure_with_unit"><b>measure_with_unit</b></a> whose
value is 1.8 degree Celsius. The offset is 32 degree
Celsius.</p>
<p style="font-family: Times; font-size: medium;"><u>EXPRESS
specification:</u></p>
<p style="font-family: Times; font-size: medium;"><code>*)<br>
ENTITY conversion_based_unit_with_offset<br>
SUBTYPE OF (<b style="font-family: Times;">conversion_based_unit</b>);<br>
offset : <a moz-do-not-send="true"
href="file:///Users/tom/Documents/2013/SMRLv5/SMRL_v5_rc5/data/resource_docs/fundamentals_of_product_description_and_support/sys/18_schema.htm#measure_schema.measure_with_unit">R</a>EAL;<br>
WHERE<br>
WR1: offset <> 0.0;<br>
END_ENTITY;<br>
(*</code></p>
<p style="font-family: Times; font-size: medium;"><u>Attribute
definitions:</u></p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><b><a
moz-do-not-send="true"
name="measure_schema.conversion_based_unit.name">offset: </a></b>the value
of the offset represented in the units of the
conversion_factor inherited from
the conversion_based_unit.</p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><u>Formal propositions:</u></p>
<p class="expressdescription" style="font-family:
Times; font-size: medium;"><b><a
moz-do-not-send="true"
name="measure_schema.conversion_based_unit.wr:wr1">WR1: The
offset shall not be zero.</a></b></p>
<div>Note: If the offset is zero, then the supertype <b
style="font-family: Times;">conversion_based_unit
</b><span style="font-family: Times;">is used.</span></div>
</div>
<div>
<div>=========end proposed addition to part
41=========</div>
</div>
<div><br>
</div>
<div>On Jun 6, 2014, at 3:29 PM, Martin Hardwick <<a
moz-do-not-send="true"
href="mailto:hardwick@steptools.com">hardwick@steptools.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
<div bgcolor="#FFFFFF" text="#000000">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<div style="margin: 0in -0.5in 0.0001pt; text-align:
center;"><b><span style="font-size:16.0pt">P21 e3
DIS Testing<o:p></o:p></span></b></div>
<div style="margin: 0in -0.5in 0.0001pt; text-align:
center;"><span style="font-size:14.0pt">Minutes of
June 5, 2104 Telecon</span><span
style="font-size:14.0pt;mso-bidi-font-family:"Times
New Roman""><o:p></o:p></span></div>
<h2>Attendees<o:p></o:p></h2>
<p class="MsoNormal"><span style="font-size:12.0pt">Martin
Hardwick </span><a moz-do-not-send="true"
href="mailto:hardwick@steptools.com"><span
style="font-size:12.0pt"><hardwick@steptools.com></span></a><span
style="font-size:12.0pt"> <br>
Robert Lipman </span><a moz-do-not-send="true"
href="mailto:robert.lipman@nist.gov"><span
style="font-size:12.0pt"><robert.lipman@nist.gov></span></a><span
style="font-size:12.0pt"> <br>
Michael Benda </span><a moz-do-not-send="true"
href="mailto:mjbenda@rockwellcollins.com"><span
style="font-size:12.0pt"><mjbenda@rockwellcollins.com></span></a><span
style="font-size:12.0pt"> <br>
Hedlind Mikael </span><a moz-do-not-send="true"
href="mailto:mikael.hedlind@scania.com"><span
style="font-size:12.0pt"><mikael.hedlind@scania.com></span></a><span
style="font-size:12.0pt"> <br>
Dave Loffredo </span><a moz-do-not-send="true"
href="mailto:loffredo@steptools.com"><span
style="font-size:12.0pt"><loffredo@steptools.com></span></a><span
style="font-size:12.0pt"> <br>
Ed Paff </span><a moz-do-not-send="true"
href="mailto:ejp@transcendata.com"><span
style="font-size:12.0pt"><ejp@transcendata.com></span></a><span
style="font-size:12.0pt"> <br>
Tom Thurman </span><a moz-do-not-send="true"
href="mailto:thomas.r.thurman@imonmail.com"><span
style="font-size:12.0pt"><thomas.r.thurman@imonmail.com></span></a><span
style="font-size:12.0pt"><o:p></o:p></span></p>
<h2>Apologies for Absence<o:p></o:p></h2>
<p class="MsoNormal"><span style="font-size:12.0pt">Jochen
Fritz </span><a moz-do-not-send="true"
href="mailto:jfritz@steptools.com"><span
style="font-size:12.0pt"><jfritz@steptools.com></span></a><span
style="font-size:12.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Nicolas
Figay </span><a moz-do-not-send="true"
href="mailto:nicolas.figay@eads.net"><span
style="font-size:12.0pt"><nicolas.figay@eads.net></span></a><span
style="font-size:12.0pt"> <br
style="mso-special-character:line-break">
<!--[if !supportLineBreakNewLine]--><br
style="mso-special-character:line-break">
<!--[endif]--></span><o:p></o:p></p>
<h2>PMI Splitting<o:p></o:p></h2>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">ITI has split the
sp3_boxy file produced by NIST into a geometry
file and a pmi file. STEP Tools has viewed the
geometry file and is working on a viewer for the
separated pmi file. The two files and the
original NIST data can be found at the following
URL:<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><a
moz-do-not-send="true"
href="ftp://www.steptools.com/private/P21e3_DIS_testing/PMI/"><span
style="font-size:12.0pt">ftp://www.steptools.com/private/P21e3_DIS_testing/PMI/</span></a><span
style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">STEP Tools is
sponsoring the development of open source
programs to split and merge P21 files using the
Edition 3 specification. The programs are
available at the following URL: </span><a
moz-do-not-send="true"
href="http://tinyurl.com/thundercode"><span
style="font-size:12.0pt">http://tinyurl.com/thundercode</span></a><span
style="font-size:12.0pt">.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<h2>ZIP Assemblies<o:p></o:p></h2>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">No visible progress has
been made on this test case since the last
telecom, but the PMI merge and split code is
being updated to handle this case as well.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><a
moz-do-not-send="true"
href="ftp://www.steptools.com/private/P21e3_DIS_testing/ZIP_Assembly/"><span
style="font-size:12.0pt">ftp://www.steptools.com/private/P21e3_DIS_testing/ZIP_Assembly/</span></a><span
style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">In the last telecom:<o:p></o:p></span></p>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">We decided the sub-tree
directory names should include the NUAO
identifier(s) for their corresponding node in
the assembly tree.<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">We learned that the
LZMA algorithm has been shown to make STEP files
three times more compressed than the more
commonly used deflate algorithm, but at the cost
of an increase in the compression time.<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">We learned that each
compressed file is required to document the
algorithm used for its compression in its header
and that different components in the same ZIP
can used different compression algorithms.<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">We recommended that the
choice of the best compression algorithm should
be left to the end user and that the standard
should be silent on the matter. <o:p></o:p></span></div>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody"><b> </b></p>
<h2>Unit Definitions<o:p></o:p></h2>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">The unit definitions
have been merged into a single file called
units.stp.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><a
moz-do-not-send="true"
href="ftp://www.steptools.com/private/P21e3_DIS_testing/Units/"><span
style="font-size:12.0pt">ftp://www.steptools.com/private/P21e3_DIS_testing/Units/</span></a><span
class="MsoHyperlink"><span
style="font-size:12.0pt"><o:p></o:p></span></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">We continued our
discussion on whether unit references should be
encoded as a URL or a URN. The following two
lines of code show equivalent URL’s and URN’s.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"><a
moz-do-not-send="true"
class="moz-txt-link-rfc2396E"
href="http://standards.iso.org/iso/10303/tech/reference_data/41/si_base_units.stp#METRE"><http://standards.iso.org/iso/10303/tech/reference_data/41/si_base_units.stp#METRE></a>;<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"><urn:iso:std:iso:10303:-41:tech:unit:metre>;<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<div style="margin: 0in -0.5in 0.0001pt 63pt;
text-indent: -63pt;"><span
style="font-size:12.0pt">Explanation of URN: <o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">urn<span
style="mso-tab-count:1"> </span>Indicates
this URI is a URN, instead of the more common
URL (http)<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">iso <span
style="mso-tab-count:1"> </span>URN
namespace (other examples are oid, usbn)<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">std<span
style="mso-tab-count:1"> </span>ISO
standard<span style="mso-spacerun:yes"> </span><o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">iso<span
style="mso-tab-count:1"> </span>originating
organization (other examples are iec, iso-ies,
iso-cie)<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">10303<span
style="mso-tab-count:1"> </span>STEP
standard <o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">-41<span
style="mso-tab-count:1"> </span>part
of multipart standard (hyphens required) <o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt">Tech<span
style="mso-tab-count:1"> </span>associated
or embedded resource defined by committee that
created the standard <o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 1in;
text-indent: -1in;"><span style="font-size:12.0pt"><the
rest><span style="mso-tab-count:1"> </span>unspecified
-- controlled by committee.<o:p></o:p></span></div>
<p class="HTMLBody"><span style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">In the above example,
the URN has small advantage over the URL but
perhaps the following URN will be acceptable
because a file does not have to exist to define
a URN.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"><urn:iso:metre>;<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">It is also conceivable
that the following URN might be acceptable even
though there are currently small technical
issues stopping the deployment of unit
definitions for a Fahrenheit measure in a STEP
file.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"><urn:iso:Fahrenheit>;
<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">We further discussed
the requirements if all the unit definitions are
to be defined in STEP files. The definition of
literal constants such as PI, and EXPRESS
constants such as negri_pi, have both led to
extensive additions to the edition 3 format for
which other strong use cases are currently
lacking.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">On the other hand the
problem might be that we have not been
sufficiently ambitious. It was pointed out that
if constants can be defined then we are close to
allowing expressions to be defined. The use of
the PLIB schema for expressions has never been
very satisfactory because the expressions are
too hard to read when encoded into the STEP
files. However, if Part 21 has an expression
evaluation capability (probably in the anchors)
then potential STEP applications such as
parametrics and construction history might
become more tractable. One interesting
possibility might be to use Modelica as the
expression language.<br
style="mso-special-character:line-break">
<!--[if !supportLineBreakNewLine]--><br
style="mso-special-character:line-break">
<!--[endif]--><o:p></o:p></span></p>
<h2>Digital Signatures<o:p></o:p></h2>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">STEP Tools gave a
demonstration of how to make a digital signature
using a private key and a signing certificate
and how to verify that a file has not been
edited since it was signed using a public key.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"><a
moz-do-not-send="true"
class="moz-txt-link-freetext"
href="ftp://www.steptools.com/private/P21e3_DIS_testing/Digital_signatures/">ftp://www.steptools.com/private/P21e3_DIS_testing/Digital_signatures/</a><o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">We discussed white
space and the issues that might arise if a file
is read into Notepad/Wordpad and converted from
line-feeds to carriage returns or vice versa.
These characters are explicitly excluded from
the Part 21 character set so they will not be
included when computing and verifying the hash
value.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">We discussed supporting
multiple signatures. The easiest procedure is
for each signature to be applied to all of the
characters that precede that signature. Thus
each new signee is also verifying the signature
of the previous signees. <o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt">For this to be
consistent it would be best if the signatures
came after the END-ISO-10303-21 keyword as shown
in the example on the ftp site.<o:p></o:p></span></p>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"><span
style="mso-list:Ignore">·<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">The next conference
call will be held on Friday June 27 at 4PM
Paris, 3PM London, 10AM New York and 7AM
Seattle.<o:p></o:p></span></div>
<p class="HTMLBody" style="margin-right:-.5in"><span
style="font-size:12.0pt"> </span></p>
<h2>Action Items<o:p></o:p></h2>
<p class="HTMLBody"
style="margin-left:.5in;text-indent:-.25in;mso-list:l0
level1 lfo3"><!--[if !supportLists]--><span
style="font-size:12.0pt;mso-fareast-font-family:Arial;mso-bidi-font-weight:bold"><span
style="mso-list:Ignore">1.<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">Complete the first ZIP
assembly example.</span><b><span
style="font-size:12.0pt;mso-bidi-font-family:
"Times New Roman""><o:p></o:p></span></b></p>
<p class="HTMLBody"
style="margin-left:.5in;text-indent:-.25in;mso-list:l0
level1 lfo3"><!--[if !supportLists]--><span
style="font-size:12.0pt;mso-fareast-font-family:Arial;mso-bidi-font-weight:bold"><span
style="mso-list:Ignore">2.<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">Consider the best
approach for unit definitions: URN’s or URLs’?</span><b><span
style="font-size:
12.0pt;mso-bidi-font-family:"Times New
Roman""><o:p></o:p></span></b></p>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;mso-fareast-font-family:Arial;mso-bidi-font-weight:bold;mso-bidi-font-style:italic"><span
style="mso-list:Ignore">3.<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt">Consider if Edition 3
should offer any support to the definition of
parametrics and if so how?</span><b><span
style="font-size:12.0pt;
mso-bidi-font-family:"Times New
Roman";mso-bidi-font-style:italic"><o:p></o:p></span></b></div>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;mso-fareast-font-family:Arial;mso-bidi-font-weight:bold;mso-bidi-font-style:italic"><span
style="mso-list:Ignore">4.<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt;mso-bidi-font-family:"Times
New Roman";mso-bidi-font-weight:
bold;mso-bidi-font-style:italic">Extend the
digital signatures example to include the
creation of signing certificates.<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.5in;
text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size:12.0pt;mso-fareast-font-family:Arial;mso-bidi-font-weight:bold;mso-bidi-font-style:italic"><span
style="mso-list:Ignore">5.<span
style="font:7.0pt "Times New
Roman""> </span></span></span><!--[endif]--><span
style="font-size:12.0pt;mso-bidi-font-family:"Times
New Roman";mso-bidi-font-weight:
bold;mso-bidi-font-style:italic">Demonstrate
signing at one site (ITI) and verification at
another site (STEP Tools).<o:p></o:p></span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.25in;"><span
style="font-size:12.0pt;
mso-bidi-font-family:"Times New
Roman";mso-bidi-font-weight:bold;mso-bidi-font-style:
italic"> </span></div>
<div style="margin: 0in -0.5in 0.0001pt 0.25in;"><span
style="font-size:12.0pt;
mso-bidi-font-family:"Times New
Roman";mso-bidi-font-weight:bold;mso-bidi-font-style:
italic"> </span></div>
<span
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New
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Mincho";mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA;mso-bidi-font-weight:bold;mso-bidi-font-style:italic">As
recorded by </span><span
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New
Roman","serif";mso-fareast-font-family:
"MS
Mincho";mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Martin
Hardwick </span><span
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New Roman","serif";
mso-fareast-font-family:"MS
Mincho";mso-ansi-language:EN-US;mso-fareast-language:
EN-US;mso-bidi-language:AR-SA"><a
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href="mailto:hardwick@steptools.com"><span
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New
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