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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 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">
<meta http-equiv="Content-Type" content="text/html;
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">
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charset=ISO-8859-1">
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<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 style="font-size:12.0pt;font-family:"Times
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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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
style="font-size:10.0pt;font-family:"Times 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
moz-do-not-send="true"
href="mailto:hardwick@steptools.com"><span
style="font-size:12.0pt"><hardwick@steptools.com></span></a></span><span
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Roman","serif";mso-fareast-font-family:
"MS
Mincho";mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">
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