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. c) The derived work is distributed under terms that allow the 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. If you have questions about this license please contact the OpenMath society at http://www.openmath.org. metasig http://www.openmath.org/cd 2006-03-30 2004-03-30 3 0 official http://www.openmath.org/cd/metasig.ocd 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 application 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. CDSComment application 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. CDSReviewDate application 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. CDSStatus application 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). Signature application 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.