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Extensible and Dynamic Topic Types for DDS
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Extensible and Dynamic Topic Types for DDS
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DDS-XTypes, version 1.3 i
OMG
®
Extensible and Dynamic Topic types for DDS (DDS-XTypes
TM
)
Extensible and Dynamic Topic Types for DDS
Version 1.3
__________________________________________________
OMG Document Number: formal/2020-02-04
Date: February 2020
Standard document URL: https://www.omg.org/spec/DDS-XTypes/1.3/
Normative Machine Consumable File(s):
https://www.omg.org/spec/DDS-XTypes/20190301/dds-xtypes_model.xmi
https://www.omg.org/spec/DDS-XTypes/20190301/dds-xtypes_type_definition.xsd
https://www.omg.org/spec/DDS-XTypes/20190301/dds-xtypes_type_definition_nonamespace.xsd
https://www.omg.org/spec/DDS-XTypes/20190301/dds-xtypes_typeobject.idl
https://www.omg.org/spec/DDS-XTypes/20190301/dds-xtypes_discovery_builtin_topics.idl
________________________________________________
ii DDS-XTypes, version 1.3
Copyright ©2008-2020, Object Management Group, Inc.
Copyright ©2008-2020, Real-Time Innovations, Inc.
Copyright ©2008-2020, ADLINK Ltd.
Copyright ©2008-2020, Twin Oaks Computing, Inc.
Copyright ©2008-2020, Object Computing, Inc.
Copyright ©2019-2020, Kongsberg Computing, Inc.
USE OF SPECIFICATION - TERMS, CONDITIONS & NOTICES
The material in this document details an Object Management Group specification in accordance with the
terms, conditions and notices set forth below. This document does not represent a commitment to
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DDS-XTypes, version 1.3 iii
GENERAL USE RESTRICTIONS
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iv DDS-XTypes, version 1.3
For a complete list of trademarks, see: https://www.omg.org/legal/tm_list.htm. All other products or
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indicate compliance with these materials.
Software developed under the terms of this license may claim compliance or conformance with this
specification if and only if the software compliance is of a nature fully matching the applicable
compliance points as stated in the specification. Software developed only partially matching the
applicable compliance points may claim only that the software was based on this specification, but may
not claim compliance or conformance with this specification. In the event that testing suites are
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may claim compliance or conformance with the specification only if the software satisfactorily completes
the testing suites.
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encourage readers to report any ambiguities, inconsistencies, or inaccuracies they may find by completing
the Issue Reporting Form listed on the main web page: https://issues.omg.org/issues/create-new-issue
.
DDS-XTypes, version 1.3 v
Table of Contents
Extensible and Dynamic Topic Types for DDS .............................................................................. i
Table of Contents ............................................................................................................................ v
Tables .............................................................................................................................................. x
Figures.......................................................................................................................................... xiii
Preface ........................................................................................................................................... xv
1. Scope ................................................................................................................................... 1
2. Conformance Criteria.......................................................................................................... 3
2.1 Programming Interface Conformance ............................................................................. 3
2.2 Network Interoperability Conformance .......................................................................... 4
2.2.1 Minimal Network Interoperability Profile .................................................................. 4
2.2.2 Basic Network Interoperability Profile ....................................................................... 4
2.3 Optional XTYPES 1.1 Interoperability Profile ............................................................... 4
2.4 Optional XML Data Representation Profile ................................................................... 5
3. Normative References ......................................................................................................... 7
4. Terms and Definitions......................................................................................................... 9
5. Symbols............................................................................................................................. 11
6. Additional Information ..................................................................................................... 13
6.1 Data Distribution Service for Real-Time Systems (DDS) ............................................ 13
6.2 Acknowledgments......................................................................................................... 15
7. Extensible and Dynamic Topic Types for DDS ............................................................... 17
7.1 Overview ....................................................................................................................... 17
7.2 Type System.................................................................................................................. 19
7.2.1 Background (Non-Normative) .................................................................................. 19
7.2.1.1 Type Evolution Example .................................................................................. 20
7.2.1.2 Type Inheritance Example ................................................................................ 21
7.2.1.3 Sparse Types Example ...................................................................................... 22
7.2.2 Type System Model .................................................................................................. 23
7.2.2.1 Namespaces ....................................................................................................... 23
7.2.2.2 Primitive Types ................................................................................................. 24
7.2.2.3 String Types ...................................................................................................... 29
7.2.2.4 Constructed Types ............................................................................................ 30
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