XSchema Spec - Element Declarations (Section 2.2), Draft 4

[Simon St.Laurent]

Following is the latest draft of Section 2.2 on Element declarations.  
XSC:More has been corrected to be optional, and a bit more explanation of some 
components has been added to address questions sent me privately.  I would 
have changed the names, but the vote was for the status quo.

As always, a prettier HTML version of this will be posted shortly at 
http://purl.oclc.org/NET/xschema.

Simon St.Laurent
Dynamic HTML: A Primer / XML: A Primer / Cookies

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 -->
<!ATTLIST XSC:ElementDecl 
       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:

<XSC:ElementDecl name="Species">
    ...additionalElementInformation... 
</XSC:ElementDecl>

This declaration would declare an element named "Species", which would appear 
in an instance as:

<Species>...content...</Species>

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, if it appears, must be unique within the document. This 
attribute may be used to uniquely identify this XSC:ElementDecl element for 
reference using 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.  Composition 
tools could use this to build a menu of likely starting points for a document.

Note that an element must declare a content model of some type, 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) are optional.

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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