PREFACE


SPECIAL NOTES

API RP66 V1 was originally published by the API in May 1991 with a clause indicating that it would not be considered an operative API styandard five years after its publication date, unless reaffirmed or republished. This document, POSC RP66 V1, is considered to be applicable indefinitely, i. e., until withdrawn or deprecated by POSC, with no requirement for periodic reaffirmation or extension.

ORGANIZATION

Structure: How Is This Document Organized?

This document is divided into seven chapters, six appendices, and a glossary.
Chapter 1:
INTRODUCTION
Chapter 2:
DATA ORGANIZATION, a description of the physical and logical hierarchies, their organizations and relationships
Chapter 3:
LOGICAL RECORD SYNTAX, a description of how logical records are represented
Chapter 4:
SEMANTIC TERMINOLOGY AND RULES, a summary of important concepts and general rules for defining elements of the standard
Chapter 5:
SEMANTICS: STATIC AND FRAME DATA, a description of Frames, the Objects required to define them, and the Objects which establish the parameters and environment for processing Frames
Chapter 6:
SEMANTICS: TRANSIENT DATA, a description of the Objects that convey messages and signify changes during acquisition and processing of Frames
Chapter 7:
SEMANTICS: DICTIONARIES, a description of the Objects that specify the semantic structure of the standard and that specify dictionary-controlled names used by the standard
Appendix A:
LOGICAL RECORD TYPES, a list of defined Types for Public and Private Logical Records
Appendix B:
REPRESENTATION CODES, a list of Representation Codes
Appendix C:
PROPERTY INDICATORS, a list of indicators used to designate the processing or corrections performed on data
Appendix D:
CHANGEABLE ATTRIBUTES, a list of those defined Attributes that are permitted to be changed (i.e., updated) in a Logical File
Appendix E:
CHECKSUM ALGORITHM, a description of the algorithm used to compute the Checksum in the Logical Record Segment Trailer.
Appendix F:
UNIT SYMBOLS, a list of symbols for base units and selected derived units
Glossary

Notation: How Is This Document Written?

Numerous cases of unusual capitalization appear in this document. Capitalized terms have special, formal, technical connotations in a DLIS context; these terms do not retain their normal English connotations. When such a special term is first introduced, it is italicized.

Acronyms are fully defined before they are used.

Many figures include comment numbers that associate a particular item with a comment that appears below the figure. For example,
Label Restrictions Comments
DESCRIPTION C = 1, R = ASCII -
OBJECT-TYPE C = 1, R = IDENT 1
OBJECT-LIST R = (OBNAME, OBJREF) 2
GROUP-LIST R = OBNAME 3
Figure 5-25. Attributes of Group Object

Comments:

1. The OBJECT-TYPE Attribute specifies ...
2. The OBJECT-LIST Attribute is a List of references to ...
3. The GROUP-LIST Attribute is a List of references to ...

Trademarks

The following is a mark of Schlumberger:
Schlumberger
The following is a mark of Digital Equipment Corporation:
VAX
The following is a mark of AT&T:
UNIX
The following is a mark of IBM:
IBM