XSchema Spec, Section 2.2 (Element Declarations), Draft 3
SimonStL at classic.msn.com
Mon Jul 6 22:53:11 BST 1998
Following is the latest draft of the Element Declarations section. It has
been updates to include id attributes (coming soon to _all_ XSchema elements)
and the root attribute, which provides suggestions to authoring tools about
the reasonable use of elements as roots. It also adds the XSC:More element to
Element declarations, providing an area for extensibility beyond the scope of
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2.2 Element Declarations
Element declarations in XSchemas are made using the XSC:ElementDecl element
and its contents:
<!ELEMENT XSC:ElementDecl (XSC:Doc?, XSC:More, (XSC:Ref | XSC:Choice | XSC:Seq
| XSC:Empty | XSC:Any | XSC:PCData | XSC:Mixed), XSC:AttDef*)>
<!-- name is the element name -->
name NMTOKEN #REQUIRED
id ID #IMPLIED
root (Recommended | Possible | Unlikely) "Possible">
The XSC:name attribute identifies the name of the element, and is required. An
element declaration would look like:
This declaration would declare an element named "Species", which would appear
in an instance as:
The XSC:name attribute must be unique within the set of elements, as it
provides the name of the element as declared here, and is also used by other
elements to refer to this element in their content model declarations.
The XSC:id attribute must be unique within the document. This attribute may be
used to uniquely identify this XSC:ElementDecl element for reference by
XPointers and other tools.
The XSC:root attribute provides authoring tools with a guide for which
elements are likely root elements for documents. This is intended to simplify
the choices presented to authors during document composition.
Note that an element must declare a content model, even if that content model
is empty. Documentation (in the XSC:Doc element), non-XSchema extensions (in
the XSC:More element) and attribute declarations (using XSC:AttDef elements)
Documentation about the element, additional extensions, content-model
information, and attribute information are stored as sub-elements of the
XSC:ElementDecl element. Documentation is covered in 2.6.1, Documentation
Extensions. Additional extensions are covered in 2.6.2, Further Extensions.
Content Model is covered in 2.3, Content Model Declarations, and attributes
are covered in 2.4, Attribute Declarations.
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