Table of Contents
XML and XLink for the SGML-Knowledgeable (or, How to Go from SGML Geek to XML Geek in One Day)
Getting started
Agenda
The XML effort
XML work
XML Working Group mandate
XML specification
XLink specifications
XSL specification
XUA specification
Whence XML
Cast of characters
XML design principles
XML and SGML are very similar
Most of XML is familiar territory
XML in the SGML context
Opportunities with XML
Where XML and SGML part company
Overview of differences
Differences in the mindset
Processing model
Processing model, cont’d
Partial and missing DTDs
Partial and missing DTDs, cont’d
Web usage
Schemas
Schemas, cont'd
Overview of differences
General language differences
Well-formedness and markup regularity
Whitespace handling
Language usage
Error handling
Overview of differences
XML and the SGML declaration
XML’s “SGML declaration”
Character repertoire
Variant concrete syntax
Variant concrete syntax, cont'd
Variant concrete syntax, cont'd
Variant concrete syntax, cont'd
Feature usage
Feature usage, cont’d
Overview of differences
Detailed functionality differences
Components of a document
Components of a document, cont'd
Components of a document, cont'd
Components of a document, cont'd
Elements
Elements, cont'd
Elements, cont'd
Elements, cont'd
Attributes
Attributes, cont'd
Attributes, cont'd
Attributes, cont'd
General entities and character references
General entities and character references, cont'd
General entities and character references, cont'd
General entities and character references, cont'd
General entities and character references, cont'd
Parameter entities
Notations
Marked sections
Marked sections, cont'd
Processing instructions
Comments
Identifiers
Making existing DTDs XML-compliant
Deciding when to make full SGML DTDs XML-compliant
If you decide to convert your DTD
Even if you decide not to convert your DTD
Cosmetic changes
DTD change for the round trip
The WebSGML Adaptations Annexes
WebSGML status
What the WebSGML annexes do
Partial overview of WebSGML
Terms and concepts
Terms and concepts, cont’d
SGML declaration changes
SGML declaration changes, cont’d
SGML declaration changes, cont’d
SGML declaration changes, cont’d
SGML declaration changes, cont’d
SGML declaration changes, cont’d
SGML declaration changes, cont’d
SGML declaration changes, cont’d
Attribute list declaration changes
Other changes
XML Linking Language (XLink)
Overview
Some hyperlinking history
History repeats itself
Hypermedia in the 60s (!)
Early hypermedia features
Consequences for end users
Then came HTML linking
Then came HTML linking limitations
1: Two elements: A and IMG
2: One link behavior for A, one for IMG
3: No real typology
4: URLs as pointing mechanism
4: URLs as pointing mechanism, cont’d
5: Privileged end lives inline in origin document
5: Privileged end lives inline in origin document, cont’d
6: Destination is a whole document
7: One end: No aggregate destinations
8: One way: A or IMG to somewhere
Overview
The XML linking effort
The XML linking effort, cont’d
The XML linking effort, cont’d
Goal #1 of the XLink family
Goal #2 of the XLink family
Status and schedule
Documents available today for the XLink family
Overview
XPointer is…
XPointer is also…
XPointer syntax
XPointer advantages
XPointers operate on tree nodes
XPointers operate on tree nodes, cont’d
Location term types
Example XML document
Absolute location terms
root() and origin()
Absolute location terms, cont’d
id() and html()
Relative location terms
Relative location terms
Relative location terms, cont’d
child() and descendant()
Relative location terms, cont’d
ancestor()
Relative location terms, cont’d
fsibling() etc.
Another way to think of relative location terms
Node types
String-match location term
Attribute location term
XPointers cannot be 100% robust
Advanced XPointers: spans
Overview
XLink is a language that...
XLink terminology
Basic XLink link types
Inline links
Out-of-line links
Simple and extended links
Link databases let you…
Link recognition
Link recognition, cont'd
Link recognition, cont'd
Types of links
Simple links
Simple links, cont’d
Extended links
Extended links, cont’d
Extended links, cont’d
Simple capers
Extended capers
Extended link groups
URI is the main locator syntax
Overview
Two axes of behavior policies
Replacement behavior
New behavior
Embedding behavior
Where to go for more information
Official resources
Other useful resources
Questions?
Thank you for your attention!
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