Appendix E
OpenMath DTD (Non-Normative)

This is a DTD generated from the Relax NG Schema described in Section 3.1. Note that we cannot express the fact that the OMFOREIGN element can contain any well-formed XML, so we have simply restricted it to contain any XML defined in the DTD.

    <?xml encoding="UTF-8"?>

<!-- RELAX NG Schema for OpenMath 2 -->

<!ENTITY % cdbase "
  cdbase CDATA #IMPLIED">

<!-- attributes common to all elements -->

<!ENTITY % common.attributes "
  id ID #IMPLIED">

<!-- attributes common to all elements that construct compount OM objects. -->

<!ENTITY % compound.attributes "
  %common.attributes;
  %cdbase;">

<!-- Elements which can appear inside an OpenMath object -->

<!ENTITY % omel "OMS|OMV|OMI|OMB|OMSTR|OMF|OMA|OMBIND|OME|OMATTR|OMR">

<!-- OpenMath object constructor -->

<!ELEMENT OMOBJ (%omel;)>
<!ATTLIST OMOBJ
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;
  version CDATA #IMPLIED>

<!ENTITY % attvar "OMATTR">

<!-- things which can be variables -->

<!ENTITY % omvar "OMV|%attvar;">

<!-- symbol -->

<!ELEMENT OMS EMPTY>
<!ATTLIST OMS
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;
  name NMTOKEN #REQUIRED
  cd NMTOKEN #REQUIRED
  %cdbase;>

<!-- variable -->

<!ELEMENT OMV EMPTY>
<!ATTLIST OMV
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;
  name NMTOKEN #REQUIRED>

<!-- integer -->

<!ELEMENT OMI (#PCDATA)>
<!ATTLIST OMI
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;>

<!-- byte array -->

<!ELEMENT OMB (#PCDATA)>
<!ATTLIST OMB
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;>

<!-- string -->

<!ELEMENT OMSTR (#PCDATA)>
<!ATTLIST OMSTR
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;>

<!-- IEEE floating point number -->

<!ELEMENT OMF EMPTY>
<!ATTLIST OMF
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;
  dec CDATA #IMPLIED
  hex CDATA #IMPLIED>

<!-- apply constructor -->

<!ELEMENT OMA (%omel;)+>
<!ATTLIST OMA
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;>

<!-- binding constructor  -->

<!ELEMENT OMBIND ((%omel;),OMBVAR,(%omel;))>
<!ATTLIST OMBIND
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;>

<!-- variables used in binding constructor -->

<!ELEMENT OMBVAR (%omvar;)+>
<!ATTLIST OMBVAR
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;>

<!-- error constructor -->

<!ELEMENT OME (OMS,(%omel;|OMFOREIGN)*)>
<!ATTLIST OME
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;>

<!-- attribution constructor and attribute pair constructor -->

<!ELEMENT OMATTR (OMATP,(%omel;))>
<!ATTLIST OMATTR
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;>

<!ELEMENT OMATP (OMS,(%omel;|OMFOREIGN))+>
<!ATTLIST OMATP
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;>

<!-- foreign constructor -->

<!ELEMENT OMFOREIGN ANY>
<!ATTLIST OMFOREIGN
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %compound.attributes;
  encoding CDATA #IMPLIED>

<!--
Any elements not in the om namespace
(valid om is allowed as a descendant)
-->

<!-- reference constructor -->

<!ELEMENT OMR EMPTY>
<!ATTLIST OMR
  xmlns CDATA #FIXED 'http://www.openmath.org/OpenMath'
  %common.attributes;
  href CDATA #REQUIRED>

Appendix EOpenMath DTD (Non-Normative)

Appendix E
OpenMath DTD (Non-Normative)