Re: Data versioning strategy: address semantic,relationship, a
Roger -- You may be interested in the one-day symposium on Versioning, to be held the day the before Balisage: The Markup Conference. For information on the Versioning preconference see: http://www.balisage.net/Versioning/index.html For information on Balisage, see: http://www.balisage.net/ I expect participants to address the issues you have identified here, among others. -- Tommie At 3:55 PM -0500 12/7/07, Costello, Roger L. wrote: >Hi Folks, > >Oftentimes when discussing a "versioning strategy" I focus on how to >design schemas in a fashion to lessen the impact of changes. It occurs >to me that this addresses only one aspect of the data versioning >problem. Below I have attempted to identify other issues to be >addressed in a data versioning strategy. I am interested in hearing >your thoughts on this. > >EVOLVING DATA > >Suppose some data is regularly exchanged between machines: > >Machine 1 --> data --> Machine 2 >Machine 1 <-- data <-- Machine 2 > >Periodically the data changes due to requirement changes, additional >insights, or from innovation. > >A change results in a new "version" of the data. > > >PROBLEM > >What are the categories of changes that may occur? What categories of >changes must be dealt with by a data versioning strategy? > > >CATEGORIES OF CHANGE > >1. Semantic - the meaning of the data changes. > >Example: > >version 1 data: a "distance" value means the distance from the center >of town. > >version 2 data: a distance value means the distance from the town line. > >2. Relationship - the relationship between the data changes. > >Example: > >version 1 data: there is a co-constraint between the start-time and the >end-time. > >version 2 data: there is a three-way co-constraint between start-time, >end-time, and mode-of-transportation. > >3. Syntax - the structure of the data changes. > >Example: > >version 1 data: the employee data is listed first and the person's name >is given by his given-name and surname. > >version 2 data: the department data is listed first and in the employee >data each person's name additionally contains a middle name. > > >SUPPORTING TECHNOLOGIES > >Suppose the data being exchanged is formatted using the XML syntax. > >Machine 1 --> XML --> Machine 2 >Machine 1 <-- XML <-- Machine 2 > >What technologies support the above categories of change? > >1. Semantic: A data dictionary may be used to define meaning. > >2. Relationship: Schematron may be used to express relationships >between data. > >3. Syntax: XML Schema, Relax NG, or DTD may be used to express the >structure of the data. > > >REQUIREMENTS ON A VERSIONING STRATEGY > >A versioning strategy must take into consideration: > >- changes in the semantics of the data >- changes in the relationships of the data >- changes in the syntax of the data > >When data is in an XML format then a versioning strategy must >implement: > >- versioning a data dictionary >- versioning a Schematron schema >- versioning an XML Schema, Relax NG schema, or DTD > > >QUESTIONS > >a. Do you agree with the three categories of change? > >b. Do these categories represent all types of change? > >c. Do you agree that a versioning strategy must address semantic, >relationship, and syntactic changes? > >/Roger > > >_______________________________________________________________________ > >XML-DEV is a publicly archived, unmoderated list hosted by OASIS >to support XML implementation and development. To minimize >spam in the archives, you must subscribe before posting. > >[Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ >Or unsubscribe: xml-dev-unsubscribe@l... >subscribe: xml-dev-subscribe@l... >List archive: http://lists.xml.org/archives/xml-dev/ >List Guidelines: http://www.oasis-open.org/maillists/guidelines.php -- ====================================================================== B. Tommie Usdin mailto:btusdin@m... Mulberry Technologies, Inc. http://www.mulberrytech.com 17 West Jefferson Street Phone: 301/315-9631 Suite 207 Direct Line: 301/315-9634 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in XML and SGML ======================================================================
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