ISO 15889:2003

INTERNATIONAL ISO
STANDARD 15889
Second edition
2003-02-15

Space data and information transfer
systems — Data description language —
EAST specification
Systèmes de transfert des informations et données spatiales —
Langage de description de données — Spécification EAST




Reference number
ISO 15889:2003(E)
©
ISO 2003

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ISO 15889:2003(E)
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ISO 15889:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 15889 was prepared by the Consultative Committee for Space Data Systems
(CCSDS) (as CCSDS 644.0-B-2, November 2000) and was adopted (without modifications except those
stated in Clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and space
vehicles, Subcommittee SC 13, Space data and information transfer systems.
This second edition cancels and replaces the first edition (ISO 15889:2000), which has been technically
revised.



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INTERNATIONAL STANDARD ISO 15889:2003(E)

Space data and information transfer systems — Data
description language — EAST specification
1 Scope
This International Standard specifies the requirements for the Enhanced Ada SubseT (EAST) language
(CCSDS 0010) used to create descriptions of data, called data description records (DDRs). The use of this
language ensures complete and exact understanding of space data as well as its automated transfer and
interpretation on any host machine having the appropriate software tools.
The scope and field of application are furthermore detailed in subclauses 1.1 and 1.2 of the enclosed CCSDS
publication.
2 Requirements
Requirements are the technical recommendations made in the following publication (reproduced on the
following pages), which is adopted as an International Standard:
CCSDS 644.0-B-2, November 2000, Recommendation for space data system standards — The data
description language — EAST specification (CCSD0010).
For the purposes of international standardization, the modifications outlined below shall apply to the specific
clauses and paragraphs of publication CCSDS 644.0-B-2.
Pages i to v
This part is information which is relevant to the CCSDS publication only.
Page 1-5
Update the following reference in 1.6 as follows:
[1] ISO/IEC 8859-1:1998, Information technology — 8-bit single-byte coded graphic character sets —
Part 1: Latin alphabet No. 1
Reference to ISO/IEC 10646-1:1993 is informative (see reference [2]). Move reference [2] to the informative
annex E on page E-1 where it should be updated to read:
[E6] 10646-1:2000, Information technology — Universal Multiple-Octet Coded Character Set (UCS) —
Part 1: Architecture and Basic Multilingual Plane
Page E-1
Add the following information to the references indicated in annex E:
[E2] Document CCSDS 620.0-B-2, May 1992, is equivalent to ISO 12175:1994.
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ISO 15889:2003(E)
3 Revision of publication CCSDS 644.0-B-2
It has been agreed with the Consultative Committee for Space Data Systems that Subcommittee
ISO/TC 20/SC 13 will be consulted in the event of any revision or amendment of publication
CCSDS 644.0-B-2. To this end, NASA will act as a liaison body between CCSDS and ISO.


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ISO 15889:2003(E)




RECOMMENDATION FOR SPACE
DATA SYSTEM STANDARDS

THE DATA DESCRIPTION
LANGUAGE EAST
SPECIFICATION
(CCSD0010)


CCSDS 644.0-B-2
BLUE BOOK

November 2000


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ISO 15889:2003(E)
(Blank page)
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
AUTHORITY



Issue: Blue Book, Issue 2
Date: November 2000
Location: Boulder, Colorado, USA


This document has been approved for publication by the Management Council of the
Consultative Committee for Space Data Systems (CCSDS) and represents the consensus
technical agreement of the participating CCSDS Member Agencies. The procedure for
review and authorization of CCSDS Recommendations is detailed in the Procedures Manual
for the Consultative Committee for Space Data Systems (reference [E1]), and the record of
Agency participation in the authorization of this document can be obtained from the CCSDS
Secretariat at the address below.



This Recommendation is published and maintained by:

CCSDS Secretariat
Program Integration Division (Code MT)
National Aeronautics and Space Administration
Washington, DC 20546, USA

CCSDS 644.0-B-2 Page i November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
STATEMENT OF INTENT


The Consultative Committee for Space Data Systems (CCSDS) is an organization officially
established by the management of member space Agencies. The Committee meets
periodically to address data systems problems that are common to all participants, and to
formulate sound technical solutions to these problems. Inasmuch as participation in the
CCSDS is completely voluntary, the results of Committee actions are termed
Recommendations and are not considered binding on any Agency.
This Recommendation is issued by, and represents the consensus of, the CCSDS Plenary
body. Agency endorsement of this Recommendation is entirely voluntary. Endorsement,
however, indicates the following understandings:
o Whenever an Agency establishes a CCSDS-related standard, this standard will be in
accord with the relevant Recommendation. Establishing such a standard does not
preclude other provisions which an Agency may develop.
o Whenever an Agency establishes a CCSDS-related standard, the Agency will provide
other CCSDS member Agencies with the following information:
-- The standard itself.
-- The anticipated date of initial operational capability.
-- The anticipated duration of operational service.
o Specific service arrangements shall be made via memoranda of agreement. Neither this
Recommendation nor any ensuing standard is a substitute for a memorandum of
agreement.
No later than five years from its date of issuance, this Recommendation will be reviewed by
the CCSDS to determine whether it should: (1) remain in effect without change; (2) be
changed to reflect the impact of new technologies, new requirements, or new directions; or,
(3) be retired or canceled.
In those instances when a new version of a Recommendation is issued, existing CCSDS-
related Agency standards and implementations are not negated or deemed to be non-CCSDS
compatible. It is the responsibility of each Agency to determine when such standards or
implementations are to be modified. Each Agency is, however, strongly encouraged to direct
planning for its new standards and implementations towards the later version of the
Recommendation.
CCSDS 644.0-B-2 Page ii November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
FOREWORD

This Recommendation is a technical Recommendation for the standardization of a language
to be used for providing syntactic and in some degree semantic information about data
interchange using Standard Formatted Data Units (SFDUs).
This Recommendation provides the syntax specification of the language EAST, which is a
subset of the Ada language.
Through the process of normal evolution, it is expected that expansion, deletion, or
modification of this document may occur. This Recommendation is therefore subject to
CCSDS document management and change control procedures which are defined in
reference [E1]. Current versions of CCSDS documents are maintained at the CCSDS Web
site:
http://www.ccsds.org/ccsds/
Questions relating to the contents or status of this document should be addressed to the
CCSDS Secretariat at the address indicated on page i.
CCSDS 644.0-B-2 Page iii November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
At time of publication, the active Member and Observer Agencies of the CCSDS were:

Member Agencies

– Agenzia Spaziale Italiana (ASI)/Italy.
– British National Space Centre (BNSC)/United Kingdom.
– Canadian Space Agency (CSA)/Canada.
– Centre National d’Etudes Spatiales (CNES)/France.
– Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)/Germany.
– European Space Agency (ESA)/Europe.
– Instituto Nacional de Pesquisas Espaciais (INPE)/Brazil.
– National Aeronautics and Space Administration (NASA)/USA.
– National Space Development Agency of Japan (NASDA)/Japan.
– Russian Space Agency (RSA)/Russian Federation.

Observer Agencies

– Austrian Space Agency (ASA)/Austria.
– Central Research Institute of Machine Building (TsNIIMash)/Russian Federation.
– Centro Tecnico Aeroespacial (CTA)/Brazil.
– Chinese Academy of Space Technology (CAST)/China.
– Commonwealth Scientific and Industrial Research Organization (CSIRO)/Australia.
– Communications Research Centre (CRC)/Canada.
– Communications Research Laboratory (CRL)/Japan.
– Danish Space Research Institute (DSRI)/Denmark.
– European Organization for the Exploitation of Meteorological Satellites
(EUMETSAT)/Europe.
– European Telecommunications Satellite Organization (EUTELSAT)/Europe.
– Federal Service of Scientific, Technical & Cultural Affairs (FSST&CA)/Belgium.
– Hellenic National Space Committee (HNSC)/Greece.
– Indian Space Research Organization (ISRO)/India.
– Institute of Space and Astronautical Science (ISAS)/Japan.
– Institute of Space Research (IKI)/Russian Federation.
– KFKI Research Institute for Particle & Nuclear Physics (KFKI)/Hungary.
– MIKOMTEK: CSIR (CSIR)/Republic of South Africa.
– Korea Aerospace Research Institute (KARI)/Korea.
– Ministry of Communications (MOC)/Israel.
– National Oceanic & Atmospheric Administration (NOAA)/USA.
– National Space Program Office (NSPO)/Taipei.
– Swedish Space Corporation (SSC)/Sweden.
– United States Geological Survey (USGS)/USA.

CCSDS 644.0-B-2 Page iv November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
DOCUMENT CONTROL

Document Title, Issue Date Status/Remarks
CCSDS 644.0-B-1 Recommendation for Space Data May 1997 Original Issue:
System Standards: The Data superseded.
Description Language EAST
Specification (CCSD0010),
Issue 1
CCSDS 644.0-B-2 Recommendation for Space Data November Current Issue:
System Standards: The Data 2000
extends EAST
Description Language EAST
ability to handle
Specification (CCSD0010),
repeated data
Issue 2
items where
repetition is
terminated by a
marker.

CCSDS 644.0-B-2 Page v November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
CONTENTS
Section Page
1 INTRODUCTION.1-1

1.1 PURPOSE AND SCOPE.1-1
1.2 APPLICABILITY.1-1
1.3 RATIONALE.1-1
1.4 DOCUMENT STRUCTURE.1-2
1.5 DEFINITIONS.1-2

1.5.1 TERMS.1-2
1.5.2 NOMENCLATURE.1-2
1.5.3 CONVENTIONS.1-3

1.6 REFERENCES.1-5

2 OVERVIEW .2-1

2.1 DESIGN AIMS.2-1
2.2 STRUCTURE OF AN EAST DESCRIPTION.2-1
2.3 LANGUAGE SUMMARY.2-2

3 DEFINITION OF THE EAST LANGUAGE .3-1

3.1 LEXICAL ELEMENTS.3-1

3.1.1 SEPARATORS AND DELIMITERS.3-1
3.1.2 COMMENTS.3-1
3.1.3 IDENTIFIERS.3-2
3.1.4 NUMERIC LITERALS.3-2

3.2 LOGICAL DESCRIPTION.3-7

3.2.1 TYPE DECLARATIONS.3-8
3.2.2 SUBTYPE DECLARATIONS.3-23
3.2.3 OBJECT DECLARATIONS.3-26
3.2.4 REPRESENTATION CLAUSES.3-30

3.3 PHYSICAL DESCRIPTION.3-41

3.3.1 STORING ARRAYS.3-42
3.3.2 STORING OCTETS/BITS.3-42
3.3.3 REPRESENTATION OF SCALAR TYPES.3-44
CCSDS 644.0-B-2 Page vi November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
3.3.4 RELATIONSHIP BETWEEN THE REPRESENTATION OF SCALAR
TYPES AND LOGICAL TYPES .3-55
3.3.5 TEMPLATE OF A PHYSICAL DESCRIPTION PART .3-57

4 RESERVED KEYWORDS .4-1

5 CONFORMANCE .5-1

ANNEX A ACRONYMS AND GLOSSARY.A-1
ANNEX B CHARACTER DEFINITION. B-1
ANNEX C EAST FORMAL SYNTAX SPECIFICATION .C-1
ANNEX D MAIN DIFFERENCES BETWEEN ADA AND EAST .D-1
ANNEX E INFORMATIVE REFERENCES. E-1
INDEX . I-1

Figure
1-1 Example of Syntax Diagram .1-3
3-1 Identifier Definition Diagram.3-2
3-2 Decimal Literal Definition Diagram .3-3
3-3 Integer Decimal Literal Definition Diagram .3-3
3-4 Real Decimal Literal Definition Diagram.3-3
3-5 Integer Definition Diagram .3-3
3-6 Exponent Definition Diagram.3-4
3-7 Based Literal Definition Diagram .3-4
3-8 Integer Based Literal Definition Diagram.3-5
3-9 Real Based Literal Definition Diagram.3-5
3-10 Based Integer Definition Diagram .3-5
3-11 Integer Literal Definition Diagram.3-6
3-12 Real Literal Definition Diagram .3-6
3-13 Logical Part Structure.3-7
3-14 Enumeration Type Specification Diagram.3-8
3-15 Enumeration Literal Definition Diagram .3-9
3-16 Integer Type Specification Diagram .3-9
3-17 Real Type Specification Diagram .3-10
3-18 Array Type Specification Diagram .3-12
3-19 Index Specification Diagram.3-12
3-20 Record Type Specification Diagram .3-14
3-21 Component Declaration Diagram.3-14
3-22 Index Constraint Diagram .3-15
CCSDS 644.0-B-2 Page vii November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
CONTENTS (continued)
Figure Page
3-23 Discriminant Specification Diagram.3-16
3-24 Variant Part Specification Diagram .3-16
3-25 Discriminants in a Packet Format .3-19
3-26 Type Summary .3-22
3-27 Subtype Declaration Diagram .3-23
3-28 Enumeration Constraint Diagram .3-23
3-29 Integer Constraint Diagram.3-24
3-30 Real Constraint Diagram.3-25
3-31 Variable Declaration Diagram .3-26
3-32 Constant Declaration Diagram.3-26
3-33 Length Clause Specification Diagram.3-30
3-34 Enumeration Clause Specification Diagram .3-32
3-35 Component Representation Clause Specification Diagram .3-33
3-36 Record Representation Clause Specification Diagram .3-33
3-37 First Tree Structure .3-35
3-38 Second Tree Structure .3-36
3-39 Third Tree Structure.3-37
3-40 Fourth Tree Structure .3-38
3-41 Distance Specification Diagram.3-40
3-42 Record Value Specification Diagram.3-48
3-43 Array Value Specification Diagram .3-48
3-44 ASCII Encoded Decimal Integer Format .3-53
3-45 ASCII Encoded Decimal Real Format .3-54

Example
1-1 Example of BNF .1-4
3-1 Decimal Literals .3-4
3-2 Based Literals.3-6
3-3 Enumeration Type Declarations.3-9
3-4 Integer Type Declarations .3-10
3-5 Real Type Declarations .3-10
3-6 Constrained Array Type Definitions .3-13
3-7 Unconstrained Array Type Definitions .3-13
3-8 Record Type Definitions .3-15
3-9 Record Type Definition with Discriminant.3-17
3-10 Record Type Definition with Discriminant.3-17
3-11 Logical Description of the Packet Format.3-21
3-12 Character Declarations .3-24
3-13 Subtype Declarations.3-25
CCSDS 644.0-B-2 Page viii November 2000
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ISO 15889:2003(E)
CCSDS RECOMMENDATION FOR EAST SPECIFICATION
CONTENTS (continued)
Example Page
3-14 Variable Declaration .3-26
3-15 Constant Declaration.3-27
3-16 Number Declarations .3-27
3-17 Marker Declaration .3-28
3-18 EOF Marker Declaration.3-29
3-19 Length Clause Declarations .3-30
3-20 Explicit Description of Unused Space .3-31
3-21 Enumeration Clause Declarations .3-32
3-22 Type Definitions.3-34
3-23 Complete Record Representation Clause Declaration .3-35
3-24 Incomplete Record Representation Clause Declaration.3-36
3-25 Complete Record Representation Clause Declaration .3-37
3-26 Complete Record Representation Clause Declaration .3-39
3-27 Record Representation Clause Using WORD_32_BITS .3-40
3-28 Actual Array Storage Method .3-42
3-29 Octet Storage Possibilities .3-43
3-30 Actual Bit Order.3-44
3-31 Bit Ordering .3-46
3-32 Bit Ordering for the Above 16-Bit Signed Integer.3-49
3-33 Actual Binary Representation of the Above 16-Bit Signed Integer .3-49
3-34 Bit Ordering for the Above 16-Bit Unsigned Integer.3-49
3-35 Actual Binary Representation of the Above 16-Bit Unsigned Integer.3-50
3-36 Bit Ordering for the Above 32-Bit Real.3-50
3-37 Actual Binary Representation of a 32-Bit Real.3-51
3-38 ASCII Enumeration Type Logical Declaration .3-53
3-39 ASCII Enumeration Type Physical Description.3-53
3-40 ASCII Integer Type Logical Declaration.3-55
3-41 ASCII Integer Type Physical Description .3-55
3-42 ASCII Real Type Logical Declaration .3-55
...