[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XML Schema 1.1 Best Practice: Positioning Additional Const
On choosing whether to place a co-occurrence constraint on the descendant or ancestor, it may help to consider the most desirable behaviour if an author is crafting an XML instance by hand using an XML Schema 1.1 validating editor. One suggested approach that an editor tool might use when adding a descendant element value, where the ancestor element is already in place: If the constraint's on the ancestor, then, when an author places the editor cursor within a constrained descendant element to enter/modify a value, the auto-complete list for permitted values would be filtered to take the constraint into account. However, if the constraint is on the descendant, then the auto-complete list would list all possible values; this would be regardless of the ancestor context, but might highlight those values that, if selected, would require a change to an ancestor to make the document valid. Then there's the need to consider the editor behaviour when an author wraps an existing element or set of elements with an ancestor element where a co-occurrence constraint exists. I have the feeling that providing helpful behaviour in XML editor tools (such as auto-complete lists) is going to be an interesting challenge with XML Schema 1.1... Phil Fearon http://qutoric.com/ On Sat, Mar 26, 2011 at 4:27 PM, Costello, Roger L. <costello@mitre.org> wrote: > Hi Folks, > > ISSUE > > XML Schema 1.1 allows additional constraints to be imposed on elements and attributes, above and beyond the constraints specified by their data type. Where should those additional constraints be positioned? Does an additional constraint on a descendant belong with the descendant or with an ancestor? > > More ... > > http://www.xfront.com/xml-schema-1-1/best-practice/Positioning-Additional-Constraints.pdf > > Comments welcome. > > /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@lists.xml.org > subscribe: xml-dev-subscribe@lists.xml.org > List archive: http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php > >
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