- From: Stephane Pageau <spageau@sed.ara.com>
- Date: Tue, 17 Jul 2001 10:05:18 -0400
- To: <xmlschema-dev@w3.org>
How can I construct a XML schema in which I wish to enforce that the content of an element (e.g., a subelement) be an existing element of the instance XML file? To clarify this question let me take an example: ------------------------------------------------ Assume that I have a shape described using a bunch of vertices and I describe both the vertices and the shape separately as follows: <vertex id=10 > <x> 10. </x> <y> 60. </y> </vertex> <vertex id=20 > <x> 10. </x> <y> 45. </y> </vertex> <vertex id=30 > <x> 10. </x> <y> 50. </y> </vertex> ... <shape id=1> <vertexptr> 10 </vertexptr> <vertexptr> 30 </vertexptr> <vertexptr> 20 </vertexptr> </shape> How can I construct my schema to make sure that someone does not put <vertexptr> 1000 </vertexptr> if the vertex with id=1000 does not exist? Note that I do not want to use the XML ref because there might be several shapes refering to the same vertex and I do not wish to repeat the coordinates of this vertex multiple times. That is, I do not want to do the following: <complexType name="vertex"/> <all> <element name="x" type="decimal" minOccurs="1"/> <element name="y" type="decimal" minOccurs="1"/> </all> <attribute name="id" type="ID"/> </complexType> <complexType name="shape"/> <element ref="vertex" minOccurs="1" maxOccurs="unbounded"/> <attribute name="id" type="ID"/> </complexType> Stephane Pageau 811 Spring Forest Rd, Suite 100 Raleigh, NC 27609 mailto:spageau@sed.ara.com (919)876-0018 fax: (919) 878-3672
Received on Tuesday, 17 July 2001 10:05:55 UTC