Carla Corkern - I've Got an SGML Database - Why do I need HyTime?		Table of contents		Indexes		David W. Cooper - HyMID Relationships

Charles F. Goldfarb - The HyTime Technical Corrigendum - Part 1

Goldfarb Charles F.

The HyTime Technical Corrigendum - Part I

Primary Objectives

Correct several known minor problems

HyTime Architecture

Distinguish general rules for defining architectures from their use in defining HyTime architecture

Eliminate ambiguities in property sets, parsing context and their impact on location addressing

Correct flaw in sbento design

Additional Objectives

DSSSL

Alignment with DSSSL

Query Language (HyQ -> SDQL)

Expression language (HyOP + HyFunk -> DSSSL)

Grove

Model of parsed SGML (Groves)

Integrated 2nd edition

Test ISO/CS SGML publishing system

Extended Facilities

SGML Extended Facilities

General applicability to SGML

HyTime architecture is not required

Definition requirements for

AFDR	Architectural Forms (AFDR)

Property

Property Set

Property Sets (PSDR)

FSI

Formal System Identifier

Formal System Identifiers (FSIDR)

General Facilities Architecture

Modular conformance : use any or all

AFDR

Architectural Form Definition Requirements

Architectural Form Definition Requirements (AFDR)

Architecture

Define "enabling architectures" for SGML documents

Element

Element type, attribute and notation forms

Permits common processing tools across multiple document types

Documents are "derived" from architectures.

Multiple derivation levels and/or bases

Architectural Form

History of Architectural Forms

Music

1984: SGML music standard proposed to ANSI

SMDL

Steven R. Newcomb

7/86: SMDL work begins (Goldfarb meets Newcomb)

SMDL

6/89: HyTime split from SMDL

DTD, Document Type Definition

Parameter Entity

Two DTDs connected by scores of parameter entities

6/90: Goldfarb proposes architectural forms

1990: HyTime becomes an architecture

AFDR	Key AFDR Concepts

Meta-DTD

Client document is "derived" from one or more "base" architectures (meta-DTDs)

Client identifies its base architectures via "architecture support declarations"

Meta-DTD

SGML Parser

Any DTD can be a meta-DTD (even a derived DTD).

An SGML parser can recognize "architectural instances" (as well as normal document instance)

Meta-DTD

Meta-DTD Syntax

Conventional Comments

Reftype

Lextype

Attribute

ATTLIST Declaration Extensions

Multiple ATTLIST declarations permitted for same element type

Single ATTLIST declaration can apply to all element types

Planned for ISO 8879 revision

AFDR	Other AFDR Features

Notation

Notation Set Architecture

Allow data attributes on start tags

Notation text in content or attributes

Processing link architectures

Association via link rules

Architecture

Architecture Status

Usable today for information modeling

HyTime is an architecture

Provides OOPS-like features for data

Transparent to normal SGML parsing

SP Parser

Initial implementation in James Clark's SP

Parses architectural instances

Many markup minimization features

DTD, Document Type Definition

HTML, Hypertext Markup Language

Use with existing DTDs (e.g. HTML)

Meta-DTD

Famous AFDR Quotation

"I never meta-DTD I didn't like" -- Norm Scharpf, 11/20/96

Structure of Corrected Standard: HyTime Architecture

Base module

Hyperdocument structure

Attribute

Common attributes

Location addressing (includes groves)

Hyperlink

Hyperlinking (includes nlink)

Scheduling

Scheduling (includes measurement)

Rendition

SGML Extended Facilities

Structure of Corrected Standard: SGML Extended Facilities Annex

Introduction

Coordinate addressing

Conformance

Grove

Propset DTD

Property Set Definition Requirements

Propset DTD

Useful property sets (e.g., datatok)

Grove construction

Canonical grove representation

Architectural Form Definition Requirements (AFDR)

General Architecture

FSI	Formal System Identifier Definition Requirements (FSIDR)

SGML Property Set (extended)

Structure of Corrected Standard: Other Annexes

HyTime Property Set

Measurement Domains

Bibliography

Property Set

Property Set Definition Requirements (PSDR)

Classes and properties recognized by a parsing process

SGML is one such process

HyTime datatok is another

SGML classes include elements, attributes, data characters

Properties of SGML elements include element type, markup, etc.

Property

Property set definition document

Grove

Graph Representation Of property ValuEs (GROVE)

Structure created by a parsing process

Graph nodes are instances of classes

Graph arcs are properties of nodes

Grove Plan

"Grove plan" determines which classes and properties are included

Grove contains multiple connected trees

Hypergrove

Groves linked to form hypergroves

DSSSL

HyTime and DSSSL address the grove structure

SGML Extended Facilities

General Architecture

Extensions to SGML semantics

Basic lexical types (lextype, HyLex)

Default value lists for implied attributes

Modular conformance: use any or all

Property Set

SGML Property Set

Everything recognized by SGML parsers

Highly modular

Abstract SGML document

SGML document string

Optional SGML features

General Architecture extensions

HyTime extensions

Standardized names for use by queries, APIs.

FSI	Formal System Identifier Definition Requirements (FSIDR)

Coexists with informal system IDs

FSI definition document describes all system storage facilities

Multiple storage managers permitted

Local:osfile, osfd

Portable: url, neutral, mimetype

Global: literal, ThisOne

Container: sbento, tar, mime

HyTime Technical Corrigendum

IMPACT OF HYTIME Technical Corrigendum

Extended Facilities

SGML Extended Facilities

SGML Extended Facilities provide major enhancements, such as

Lexical typing enhances control over attribute values and data, >= data base definitions

FSI	FSIs allow network awareness with no change to document instances (SP EM already runs!)

DSSSL

SDQL

DSSSL and HyTime have common SDQL query language, SGML property set, and addressing model.

SGML revision will incorporate SGML Extended Facilities


Carla Corkern - I've Got an SGML Database - Why do I need HyTime?		Table of contents		Indexes		David W. Cooper - HyMID Relationships

The HyTime Technical Corrigendum - Part I

Primary Objectives

Additional Objectives

SGML Extended Facilities

Architectural Form Definition Requirements (AFDR)

History of Architectural Forms

Key AFDR Concepts

Meta-DTD Syntax

Other AFDR Features

Architecture Status

Famous AFDR Quotation

Structure of Corrected Standard: HyTime Architecture

Structure of Corrected Standard: SGML Extended Facilities Annex

Structure of Corrected Standard: Other Annexes

Property Set Definition Requirements (PSDR)

Graph Representation Of property ValuEs (GROVE)

General Architecture

SGML Property Set

Formal System Identifier Definition Requirements (FSIDR)

IMPACT OF HYTIME Technical Corrigendum