Re: RE: When you create a markup language, what do yourparent
I think most examples of parent-child relationships fall into one of three categories: (a) representing the properties of an object <book> <price>3.25</price> </book> (b) representing a one-to-many relationship (often a "containment" or "aggregation" relationship, though in my experience data modellers do not use those terms consistently) <county name="Berkshire"> <town name="Windsor"/> <town name="Reading"/> </county> (c) representing a many-to-many relationship with the help of link elements: <xs:attribute-group name="G"> <xs:attribute ref="A"/> <xs:attribute ref="B"/> </xs:attribute-group> (represents a many-to-many relationship between attribute groups and attributes). In each case there are other choices available to the schema designer, and different designers will quite legitimately make different choices; there are no "normalization rules" governing XML schema design as there are in relational databases. A good schema design will however exhibit some internal consistency. Document modelling is of course rather different from data modelling. With document-oriented models, the parent-child relationship usually reflects a textual containment hierarchy that corresponds to the abstracted structure of a rendition of the document. Michael Kay Saxonica On 26/09/2011 23:49, Costello, Roger L. wrote: > Hi Folks, > > These two markup languages have a consistent definition of what parent elements and child elements mean: > > 1. RDF > 2. GML > > Both languages specify that parent elements represent a resource or object and child elements represent properties or attributes. > > Are those the only markup languages that have a consistent definition of what parent elements and child elements mean? > > If one is creating a markup language and wants to adopt a consistent definition for parent elements and child elements, is resource/object and property/attribute the only way to accomplish it? > > Is an Object-Oriented approach to markup the only viable approach when one wants to have a consistent definition for parent elements and child elements? That would be quite astonishing, given that people such as Tim Bray argue that "XML is 180 degrees apart from OO". > > /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: email@example.com > subscribe: firstname.lastname@example.org > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > >
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