# OpenMath Content Dictionary: metasig

Canonical URL:
http://www.openmath.org/cd/metasig.ocd
CD Base:
http://www.openmath.org/cd
CD File:
metasig.ocd
CD as XML Encoded OpenMath:
metasig.omcd
Defines:
CDSComment, CDSReviewDate, CDSStatus, CDSignatures, Signature
Date:
2004-03-30
Version:
3 (Revision 1)
Review Date:
2017-12-31
Status:
official


This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The copyright holder grants you permission to redistribute this
document freely as a verbatim copy. Furthermore, the copyright
holder permits you to develop any derived work from this document
provided that the following conditions are met.
a) The derived work acknowledges the fact that it is derived from
this document, and maintains a prominent reference in the
work to the original source.
b) The fact that the derived work is not the original OpenMath
document is stated prominently in the derived work.  Moreover if
both this document and the derived work are Content Dictionaries
then the derived work must include a different CDName element,
chosen so that it cannot be confused with any works adopted by
the OpenMath Society.  In particular, if there is a Content
Dictionary Group whose name is, for example, math' containing
Content Dictionaries named math1', math2' etc., then you should
not name a derived Content Dictionary mathN' where N is an integer.
However you are free to name it private_mathN' or some such.  This
is because the names mathN' may be used by the OpenMath Society
for future extensions.
compilation of derived works, but keep paragraphs a) and b)
intact.  The simplest way to do this is to distribute the derived
work under the OpenMath license, but this is not a requirement.
society at http://www.openmath.org.

  Author: OpenMath Consortium
SourceURL: https://github.com/OpenMath/CDs


This is a content dictionary to represent Content Dictionary Signature Files, so that they may be encoded as OpenMath Objects, which is a possible way of passing this information between OpenMath Applications.

1999-05-04 First Draft. David Carlisle


## CDSignatures

Role:
application
Description:

This symbol is used to represent the outermost element of the Signature File which is characterized by two required attributes that identify the type system and the Content Dictionary whose signatures are defined. The value of the XML attribute 'type' is the name of the Content Dictionary or of the CDGroup that represents the type system. The value of the XML attribute 'cd' is the name of the Content Dictionary whose symbols are assigned signatures in this Signature File. It has an arbitrary number of arguments which may be elements of type corresponding to the other symbols defined in this file.

Signatures:
sts

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## CDSComment

Role:
application
Description:

This symbol is used to represent the element of a signature file which explains some aspect of that signature file. It should have one string argument which makes that explanation.

Signatures:
sts

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## CDSReviewDate

Role:
application
Description:

This symbol is used to represent the element of a signature file which specifies the earliest possible revision date of the signature file. It should have one string argument which specifies that date. The date should be in the format YYYY-MM-DD, e.g. 2000-02-29.

Signatures:
sts

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## CDSStatus

Role:
application
Description:

This symbol is used to represent the element of a signature file which specifies the status of that signature file. It should have one string argument, which should be one of 'official' (approved by the OpenMath Society according to the procedure outlined in the OpenMath standard), 'experimental' (currently being tested), 'private' (used by a private group of OpenMath users) or 'obsolete' (an obsolete signature file, kept only for archival purposes).

Signatures:
sts

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## Signature

Role:
application
Description:

This symbol is used to represent the element of a signature file which specifies the signature of a symbol. It should take two string children, the first should be the symbol who's signature is being specified, the second should be an 'OMOBJ' element which specifies the signature. Additionally the second argument should specify an object which must represent a valid type in the type system identified by the XML attribute 'type' corresponding to the element which corresponds to the symbol 'CDSignatures' enclosing this symbol.

Signatures:
sts

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