ISO 19155-2:2017 地理情報—場所識別子（PI）アーキテクチャ—パート2：場所識別子（PI）のリンク | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 211, Geographic information/Geomatics.

A list of all parts in the ISO 19155 series can be found on the ISO website.

Introduction

The Place Identifier (PI) architecture (ISO 19155) defined the conceptual model of a place and specified normative encodings, for Place Identifiers, not specific to any type of geographic feature. In this document, three mechanisms are presented that define how Place Identifiers can be linked with features or objects in other encodings. Even though the identifiers of those features or objects may not specifically be a place, they may be referred to conceptually as “other identifiers.”

Figure 1 depicts the abstractions of linking mechanisms among feature/object encoding rules.

Figure 1—Linkages with other encoding rules

a) Without the use of a Place Identifier

b) With the use of a Place Identifier

Key

	encoding rules
	linkages

The linking mechanisms presented in this document are based on accepted information technology for object identification and reference using gml:id, UUID, or URL. By using these linking mechanisms with the rules defined here, and according to the type of encoding rule being linked to, Place Identifiers can more uniformly be related to features and objects — other identifiers — in other encodings. This extends the functionality of those other identifiers, in different encodings, by linking with Place Identifiers encoded in GML.

Existing PI data can complement a range of other encodings through the use of the linking mechanisms defined in this document.

For example, a group of Place Identifiers representing stores in a shopping mall can be associated with the specific locations inside the shopping mall represented by a GML data set.

1 Scope

This document defines the following three mechanisms for linking Place Identifiers (PIs) (see ISO 19155) to features or objects existing in other encodings:

• Id attribute of a GML object (gml:id) as defined in ISO 19136;
• Universally Unique Identifier (UUID) as defined in IETF RFC 4122;
• Uniform Resource Locator (URL) as defined in IETF RFC 1738.

These PI linking mechanisms are enabled using xlink:href as defined in W3C XML Linking Language (XLink).

While the identifiers of these features or objects can sometimes identify a place, within the scope of this document, the identifiers of features or objects existing in other encoding domains are referred to conceptually as other identifiers.

This document further defines that when PIs are encoded, as specified in ISO 19155, using the Geography Markup Language (GML) (ISO 19136), they are linked using gml:id to other GML encoded features. The details of encoding GML instances using gml:id are specified in a normative annex.

Additional normative annexes define encodings for linking Place Identifiers to other identifiers using UUID and URL and present examples for their use.

This document is applicable to location-based services, linked open data, robotic assisted services and other application domains that require a relationship between PIs and objects in either the real or virtual world.

This document is not about creating a registry of Place Identifiers linked to specific features or objects, and support of linking mechanisms other than gml:id, UUID, and URL is out of the scope of this document.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 19155 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography