DDS-XTypes 1.3：可扩展与动态主题类型标准

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"DDS-XTypes, 版本1.3，是Object Management Group (OMG) 提出的一种针对分布式数据交换(Domain-Specific Distributed Data Exchange, DDS)系统的可扩展和动态主题类型解决方案。该标准旨在增强DDS在物联网(IoT)等领域的灵活性，允许用户自定义数据类型，适应不断变化的应用需求。在DDS-XTypes中，关键概念包括： 1. **扩展性**：通过提供一套开放的框架，用户可以根据实际应用场景定义新的数据类型（Type Definition），这些类型可以包含复杂的结构、枚举、序列和接口，从而支持丰富的数据通信。这有助于在不改变原有基础架构的情况下，增加新的数据处理能力。 2. **动态性**：DDS-XTypes允许运行时的类型发现和适应。这意味着，当设备或系统加入网络时，它们可以动态地注册或请求自定义的数据类型，使得不同设备之间能够无缝协作，即使它们使用不同的数据模型。 3. **标准化规范**：标准文档（如 OMGDocumentNumber:formal/2020-02-04）提供了详细的模型、类型定义语言（Type Definition Language, IDL）、XML Schema定义等，确保了跨平台和互操作性。此外，还包含了预定义的内置主题类型，如discovery topics，便于实现自动发现和连接。 4. **版权与许可**：DDS-XTypes是由多个公司如Object Management Group, Real-Time Innovations, ADLINK, Twin Oaks Computing和Object Computing等共同开发和维护，遵循相应的版权协议，确保技术的开源性和商业可用性。 5. **机器可消费文件**：标准提供了多份机器可读的文件，如XMI模型、XML Schema和IDL定义，为工具链支持和自动化处理提供了必要的支持。 DDS-XTypes 1.3是DDS生态系统中的一个重要补充，它通过扩展和动态的主题类型，增强了DDS在物联网环境下的灵活性和适应性，对于提升实时数据交换的效率和兼容性具有重要意义。"

xvi DDS-XTypes, version 1.3

• CORBA Component Model (CCM)

Platform Specific Model and Interface Specifications

• CORBA services

• CORBA facilities

• OMG Domain specifications

• OMG Embedded Intelligence specifications

• OMG Security specifications

All of the OMG’s formal specifications may be downloaded without charge from our website.

(Products implementing OMG specifications are available from individual suppliers.) Copies of

specifications, available in PostScript and PDF format, may be obtained from the Specifications

Catalog cited above or by contacting the Object Management Group, Inc. at:

OMG Headquarters

109 Highland Avenue

Needham, MA 02494, USA

Tel: +1-781-444-0404

Fax: +1-781-444-0320

Email: pubs@omg.org

Certain OMG specifications are also available as ISO standards. Please consult

https://www.iso.org/.

Typographical Conventions

The type styles shown below are used in this document to distinguish programming statements

from ordinary English. However, these conventions are not used in tables or section headings

where no distinction is necessary.

Times/Times New Roman - 10 pt.: Standard body text

Helvetica/Arial - 10 pt. Bold: OMG Interface Definition Language (OMG IDL) and

syntax elements.

Courier - 10 pt. Bold: Programming language elements.

Helvetica/Arial - 10 pt: Exceptions

Terms that appear in italics are defined in the glossary. Italic text also represents the name of a

document, specification, or other publication.

Issues

The reader is encouraged to report any technical or editing issues/problems with this

specification to https://issues.omg.org/issues/create-new-issue.

4 DDS-XTypes, version 1.3

2.2 Network Interoperability Conformance

There are two Network Interoperability conformance profiles. An implementation may claim

conformance to the Minimal profile or to the Basic profile, which extends the Minimal.

Regardless of profile, conformance with respect to network interoperability requires

conformance to the Real-Time Publish-Subscribe Wire Protocol specification [RTPS].

2.2.1 Minimal Network Interoperability Profile

Conformance with the Minimal Network Interoperability profile requires conformance with the

following clauses of this specification:

• “Representing Types with TypeIdentifier and TypeObject” (Clause 7.3.4)

• From “Use of the Type System by DDS" (Clause 7.6)

o “Topic Model” (Clause 7.6.1)

o “Discovery and Endpoint Matching” (Clause 7.6.3) excluding “Built-in

TypeLookup service” (Clause 7.6.3.3)

 Clause 7.6.3.1.1 “DataRepresentationQosPolicy: Conceptual Model”,

with support limited to version 2 encoding.

o “Interoperability of Keyed Topics” (Clause 7.6.8)

• “Extended CDR Representation (encoding version 2)” (Clause 7.4.2)

• “Extended CDR encoding virtual machine” (Clause 7.4.3)

• Annex B: Representing Types with TypeObject

• Annex D: DDS Built-in Topic Data Types

2.2.2 Basic Network Interoperability Profile

This profile adds type safety to the Minimal profile. It enables checking type compatibility

between published and subscribed types as a precondition for matching the endpoints.

Conformance with the Basic Network Interoperability Profile requires conformance with the

Minimal Network Interoperability profile and the following clauses:

• “Built-in TypeLookup service” (Clause 7.6.3.3)

2.3 Optional XTYPES 1.1 Interoperability Profile

This profile adds interoperability with implementations that conform with version 1.1 of the

XTYPES specification.

Conformance with the XTYPES 1.1 Interoperability Profile requires conformance with the Basic

Network Interoperability profile and support of version 1 encoding in Clause 7.6.3.1.1

“DataRepresentationQosPolicy: Conceptual Model.”

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