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MISC-684172BF

July 1986

223 pages

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4.9MB

Document:	Series of Technical Presentations Relating to the Digital Document Interchange Format
Order Number:	MISC-684172BF
Revision:
Pages:	223
Original Filename:

OCR Text

SERIES OF TECHNICAL PRESENTATIONS RELATING TO THE
DIGITAL DOCUMENT INTERCHANGE FORMAT
BABBAGE AUDITORIUM, SPIT BROOK ROAD FACILITY
JULY 9, 10, 11
Vednesday July 9
9:30

Review of DDIF status
Review/update of agenda

10:00

Introduction to DDIF

Bob Travis

DDIF has been under development at Digital for over a
year, and forms the basis for at two current document
processing development efforts.
This introductory
presentation will describe DDIF's syntax and semantics.
11:30

lunch break

13:00

DDIF/DDIS VMS RTL-Access

Bill Laurune

Two utility packages will be d€ ribed. The first
package provides low level access .0 DDIS TLV-encoded
data.
The subroutines will prov Ie basic encoding
functions (such as length field cons ruction) and syntax
checking based on dynamically loaded syntax tables.
The second routine package is DDIF specific, and
provides the service of maintaining the current context
of DDIF segment attributes.
The DDIS access routine package is scheduled for
submission to the VAX/VMS Run-Time Library in VS.O. The
DDIF access routines are not currently scheduled for RTL
submission,
but
will
be available
for by DEC
applicatiobs.
14:20

coffee break

14:40

VPSPLUS/DECPAGE logical access

Bruce Taylor

The Logical Access Layer (LAL) is planned as a
functional interface to DDIF documents. It provides
primitives for data editing, hierarchical navigation,
searching and attribute resolution.
For each open
document,
the
LAL maintains a tree representing
structure and content. If the document is large, not all
of this data is represented explicitly at a given time;
but from the caller's point of view, the entire document
appears to be "in memory".

This talk will describe a high-level design for the LAL
and its internal data structures, together with two
related components: the Cache Manager, which controls
paging of the data structure; and the Physical Access
Layer, which converts between the internal format and
DDIF.
16:00

DDIS Character Sets

Tom Hastings

DDIS is the basic data syntax upon which DDIF is based.
It defines the encoding of all binary and character
items. Fundamental to any DDIF application are the text
character
sets;
DDIS defines both 8- and 16-bit
character set encodings. This session will describe the
on-going process to define these character sets, and the
pending issues surrounding them.
17:00

end of day

Thursday July 10
9:30

Status of s~andards in computer
graphics & documents

Dr. J. Schonhut
et ale

Under the auspices of an extern?' research grant,
Fraunhofer-Gesellshaft and the Tee ical University at
Darmstadt
researchers
have
en
doing
some
investigations into the application f DDIF to existing
and future graphics applications.
All of today's
sessions
are
related to various aspects of that
research, and will be presented by Dr. Jurgen Schonhut
and
some
of
his
associates
from
the
Fraunhofer-Gesellshaft.
Schonhut et ale