GNU Info

(psgml.info)Introduction

---

Next: Install Prev: Top Up: Top

---

Enter node , (file) or (file)node

Introduction
************

   PSGML is a major mode for editing SGML and XML documents.  It works
with GNU Emacs 19.34, 20.3 and later or with XEmacs 19.9 and later.
PSGML contains a simple SGML parser and can work with any DTD.
Functions provided includes menus and commands for inserting tags with
only the contextually valid tags, identification of structural errors,
editing of attribute values in a separate window with information about
types and defaults, and structure based editing.

   SGML, a language for encoding the structure of a document, is an ISO
standard: ISO 8879:1986 "Information processing - Text and office
systems - Standard Generalized Markup Language (SGML)".

   A good introduction to SGML is `A Gentle Introduction to SGML'
produced by Text Encoding Initiative (this is really chapter 2 of TEI
P3).  This can be found on

     `ftp://ftp.ifi.uio.no/pub/SGML/TEI/P3SG.DOC'.

   A SGML document has three major parts, in order:

  1. SGML Declaration (`<!SGML "ISO 8879:1986" ... >')

  2. Document Type Declaration (`<!DOCTYPE NAME ... >')

  3. Document Element (`<NAME> ... </NAME>')

   The SGML declaration contains general information about character
sets, concrete syntax, and SGML features used.  PSGML does not use the
SGML Declaration, it can be left out, and if included is ignored.  Many
SGML systems allow the SGML declaration to be defaulted.  PSGML always
use the Concrete Reference Syntax but without limitations on lengths.
Features used has to be indicated with variables (Note: SGML
declaration).

   The document type declaration specifies the valid elements and
entities and how they can be nested. A document type is usually needed,
but can reside in another file (Note: Managing the DTD).

   The system declaration for PSGML:
     SYSTEM "ISO 8879:1986"
        CHARSET
          BASESET  "ISO 646-1983//CHARSET
                    International Reference Version (IRV)//ESC 2/5 4/0"
          DESCSET  0 128 0
          CAPACITY PUBLIC  "ISO 8879:1986//CAPACITY Reference//EN"
        FEATURES
          MINIMIZE DATATAG NO  OMITTAG  YES   RANK     NO  SHORTTAG YES
          LINK     SIMPLE  NO  IMPLICIT NO    EXPLICIT NO
          OTHER    CONCUR  NO  SUBDOC   YES 1 FORMAL   YES
          SCOPE    DOCUMENT
          SYNTAX   PUBLIC  "ISO 8879:1986//SYNTAX Reference//EN"
          VALIDATE
                   GENERAL NO  MODEL    NO   EXCLUDE  NO  CAPACITY NO
                   NONSGML NO  SGML     NO   FORMAL   NO
          SDIF     PACK    NO  UNPACK   NO