XSchema Spec Section 2.0 and 2.1, Draft 3
SimonStL at classic.msn.com
Wed Jul 1 16:08:27 BST 1998
The third (and hopefully final) draft of sections 2.0 and 2.1 follows. There
was a mystery 2nd draft that I failed to post; it just removed entities from
the spec. This version adds the XSC:More extension element. Both versions
will be posted shortly at http://purl.oclc.org/NET/xschema.
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2.0 XSchema Syntax
This section describes the XSchema document syntax. The XSchema document is an
XML document containing a single XSchema element in which information
describing the schema is nested. The XSchema element must be preceded by an
XML declaration and may be preceded by other declarations, comments, and
2.1 The XSchema Element
The XSchema element is the root element for all XSchema documents. The
declaration for the XSchema element is:
<!ELEMENT XSC:XSchema (XSC:Doc?, XSC:More?, (XSC:ElementDecl | XSC:Notation |
XSC:Namespace | XSC:XSchema)*)>
Version CDATA #FIXED "1.0"
MimeType CDATA "application/xml"
FileExtension CDATA "xml">
The XSC:XSchema element contains other elements describing the XSchema and
building a schema. These elements are described in later sections of this
specification. The XSC:XSchema element may also contain other XSC:XSchema
elements nested inside of it.
The XSC:XSchema element's attributes include information about the version of
XSchema used as well as information about the type of documents created using
XSchema version information, contained in the XSC:Version attribute, is
critical to proper handling of documents should the specification be updated
in the future. This specification is identified as version 1.0. Future major
and minor versions of XSchema should identify themselves differently. No
provision is made at this time for nesting XSchemas of different versions
under a parent XSchema element.
The XSC:MimeType and XSC:FileExtension attributes are used to provide a
suggested MIME (Multipurpose Internet Mail Extensions) Content-type and file
extension for documents created using a particular XSchema. Applications may
use this information to identify XML document types. A document library that
generates XML documents dynamically could assign file extensions and MIME
types based on the XSchema used.
Applications using this information should use the values stored in the first
XSchema encountered during processing. For instance, if an XSchema includes
another nested XSchema, the values for the XSC:MimeType and XSC:FileExtension
attributes of the root XSchema should be used.
By default, most XML documents are assumed to have a MIME type of
application/xml, as described in "XML Media Types" by E.J. Whitehead and
Murata Makoto. Developers who need different MIME types for documents created
using particular XSchemas may register other MIME types with the IETF, as
described in RFC 1590, or use the 'x-' prefix syntax for subtypes, as
described in RFC 1521.
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