<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Created bugzilla #5069 to capture details,<div>added a sample population to the bug.</div><div>Tom</div><div><br><div><div>>On Jun 7, 2014, at 5:46 PM, thomas thurman <<a href="mailto:thomas.r.thurman@imonmail.com">thomas.r.thurman@imonmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><meta http-equiv="Content-Type" content="text/html charset=windows-1252"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Addendum for Fahrenheit discussion.<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: inherit;">A </span><b style="font-family: Times; font-size: inherit;">conversion_based_unit</b><span style="font-family: Times; font-size: inherit;"> is a type of </span><a 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: inherit;"><b>named_unit</b></a><span style="font-family: Times; font-size: inherit;"> that defines a unit on the basis of a </span><a 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: inherit;"><b>measure_with_unit</b></a><span style="font-family: Times; font-size: inherit;">.</span><p class="note" style="font-family: Times; font-size: inherit;"><small><a name="note_">NOTE </a> The <a 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 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: inherit;"><small><a 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 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 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 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: inherit;"><u>EXPRESS specification:</u></div><p style="font-family: Times; font-size: inherit;"><code>*)<br>ENTITY conversion_based_unit<br> SUBTYPE OF (<a 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 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 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: inherit;"><u>Attribute definitions:</u></p><p class="expressdescription" style="font-family: Times; font-size: inherit;"><b><a name="measure_schema.conversion_based_unit.name">name: </a></b>the <a 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: inherit;"><b><a name="measure_schema.conversion_based_unit.conversion_factor">conversion_factor: </a></b>the <a 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: inherit;"><u>Formal propositions:</u></p><p class="expressdescription" style="font-family: Times; font-size: inherit;"><b><a name="measure_schema.conversion_based_unit.wr:wr1">WR1: </a></b>The dimensional exponents shall be equal to those from the <a 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: inherit;">A </span><b style="font-family: Times; font-size: inherit;">conversion_based_unit_with_offset</b><span style="font-family: Times; font-size: inherit;"> is a type of </span><b style="font-family: Times; font-size: inherit;">conversion_based_unit</b><span style="font-family: Times; font-size: inherit;"> that includes a scale offset</span><span style="font-family: Times; font-size: inherit;">.</span></div><div><p class="note" style="font-family: Times; font-size: inherit;"><a 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 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 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: inherit;"><u>EXPRESS specification:</u></p><p style="font-family: Times; font-size: inherit;"><code>*)<br>ENTITY conversion_based_unit_with_offset<br> SUBTYPE OF (<b style="font-family: Times;">conversion_based_unit</b>);<br> offset : <a 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: inherit;"><u>Attribute definitions:</u></p><p class="expressdescription" style="font-family: Times; font-size: inherit;"><b><a 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: inherit;"><u>Formal propositions:</u></p><p class="expressdescription" style="font-family: Times; font-size: inherit;"><b><a 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>=========end proposed addition to part 41=========</div><div><br></div><div>On Jun 6, 2014, at 3:29 PM, Martin Hardwick <<a 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">
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<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 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 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 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 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 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 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 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 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 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><a 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div>
<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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><a 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><a 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><span style="font-size:12.0pt"><a 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><span style="font-size:12.0pt"><urn:iso:metre>;<o:p></o:p></span></p><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><span style="font-size:12.0pt"><urn:iso:Fahrenheit>;
<o:p></o:p></span></p><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><p class="HTMLBody" style="margin-right:-.5in"><span style="font-size:12.0pt"><a 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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div><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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></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">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><div style="margin-right: -0.5in;"><span style="font-size:12.0pt"> </span><br class="webkit-block-placeholder"></div>
<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 style="font-size:12.0pt;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">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 href="mailto:hardwick@steptools.com"><span style="font-size:12.0pt"><hardwick@steptools.com></span></a></span><span style="font-size:12.0pt;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">
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