Astro-Constants
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AUTHOR_NOTES.md  view on Meta::CPAN 

 * note deprecation in ChangeLog
* wait minimum of 2 versions and 2 years
* remove constant from PhysicalConstants file (to RemovedConstants.xml?)
 * note removal in ChangeLog

## Add *symbol* to PhysicalConstants.xml schema

* adding entity "symbol" to schema
  * no type attribute required if constant is a Latin character
  * otherwise
    * unicode
    * description, usually the unicode description of the character(s)
    * latex and html are the representations to produce the symbol
      * need to find the XML representation of & so that I can produce π in valid XML
    * ascii - how symbol is traditionally rendered in ascii format
* take a look a the diff between PhysicalConstants.xml and PhysicalConstants_with_symbols.xml


# Design decisions

## PhysicalConstants

data/PhysicalConstants.xml  view on Meta::CPAN 

        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>STEFAN_BOLTZMANN</name>
      <alternateName/>
      <symbol>
        <symbolRepresentation>
          <latex>\sigma</latex>
          <html>&amp;sigma;</html>
          <unicode>σ</unicode>
        </symbolRepresentation>
      </symbol>
      <description>Stefan-Boltzmann constant</description>
      <value>5.670374419e-8</value>
      <uncertainty type="relative">1.7e-10</uncertainty>
      <dimensions mass="1" time="-3" temperature="-4"/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?sigma" authority="2018 CODATA" year="2019"/>
      <source url="https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant"/>

data/PhysicalConstants.xml  view on Meta::CPAN 

        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>IMPEDANCE_VACUUM</name>
      <alternateName>VACUUM_IMPEDANCE</alternateName>
      <symbol>
        <symbolRepresentation>
          <latex>Z_{0}</latex>
          <html>Z&lt;sub&gt;0&lt;/sub&gt;</html>
          <unicode>Zâ‚€</unicode>
        </symbolRepresentation>
      </symbol>
      <description>characteristic impedance of vacuum</description>
      <value>376.730313461</value>
      <uncertainty type="relative">1e-50</uncertainty>
      <dimensions mass="1" lenghth="2" time="-3" current="-2"/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?z0"/>
      <categoryList>

data/PhysicalConstants.xsd  view on Meta::CPAN 

  <xs:element name="categoryList">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="category" type="xs:string" maxOccurs="unbounded"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="symbolRepresentation">
    <xs:complexType>
      <xs:choice maxOccurs="6">
        <xs:element name="unicode" type="xs:string"/>
        <xs:element name="codepoint" type="xs:string"/>
        <xs:element name="description" type="xs:string"/>
        <xs:element name="latex" type="xs:string"/>
        <xs:element name="html" type="xs:string"/>
        <xs:element name="ascii" type="xs:string"/>
      </xs:choice>
    </xs:complexType>
  </xs:element>
  <xs:element name="deprecated">
    <xs:complexType>

data/old_versions/constants_2020_v0.14.xml  view on Meta::CPAN 

      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">STEFAN_BOLTZMANN</name>
      <name type="short">A_sigma</name>
      <alternateName/>
      <symbol>
	<symbolRepresentation>
	  <latex>\sigma</latex>
	  <html>&amp;sigma;</html>
	  <unicode>σ</unicode>
        </symbolRepresentation>
      </symbol>
      <description>Stefan-Boltzmann constant</description>
      <value system="MKS">5.670374419e-8</value>
      <value system="CGS">5.670367e-5</value>
      <uncertainty type="relative">1.7e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?sigma" authority="2018 CODATA" year="2019" />

data/old_versions/constants_2020_v0.14.xml  view on Meta::CPAN 

      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">IMPEDANCE_VACUUM</name>
      <name type="short">A_Z0</name>
      <alternateName>VACUUM_IMPEDANCE</alternateName>
      <symbol>
	<symbolRepresentation>
          <latex>Z_{0}</latex>
	  <html>Z&lt;sub&gt;0&lt;/sub&gt;</html>
	  <unicode>Zâ‚€</unicode>
        </symbolRepresentation>
      </symbol>
      <description>characteristic impedance of vacuum</description>
      <value>376.730313461</value>
      <uncertainty type="relative">1e-50</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?z0"/>
      <categoryList>



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