Section 7: Appendix C (Glossary/Acronyms)

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For the purposes of this document, the following terms and definitions have been taken from the OpenGIS Web Feature Service 2.0 Interface Standard, Open Geospatial Consortium Inc

attribute (XML)
name-value pair contained in an element (4.6)
[ISO 19136:2007, definition 4.1.3]
NOTE In this document an attribute is an XML attribute unless otherwise specified.

client
software component that can invoke an operation (4.17) from a server (4.28)
[ISO 19128:2005, definition 4.1]

coordinate
one of a sequence of n numbers designating the position of a point in n-dimensional space
[ISO 19111:2007, definition 4.5]

coordinate reference system
coordinate system(4.5) that is related to an object by a datum
[ISO 19111:2007, definition 4.8]

coordinate system
set of mathematical rules for specifying how coordinates (4.3) are to be assigned to points
[ISO 19111:2007, definition 4.10]

element (XML)
basic information item of an XML document containing child elements, attributes (4.1) and character data
[ISO 19136:2007, definition 4.1.23]

feature
abstraction of real world phenomena
[ISO 19101:2002, definition 4.11]
NOTE A feature can occur as a type or an instance. The term "feature type" or "feature instance" should be used when only one is meant.

feature identifier
identifier that uniquely designates a feature (4.7) instance OGC 09-025r1 and ISO/DIS 19142

filter expression
predicate expression encoded using XML
[ISO 19143, definition 4.11]

interface
named set of operations (4.17) that characterize the behaviour of an entity
[ISO 19119:2005, definition 4.2]

join predicate
filter expression (4.9) that includes one or more clauses that constrain properties from two different entity types
[ISO 19143, definition 4.16]
NOTE In this International Standard, the entity types will be feature (4.7) types.

join tuple
set of two or more object instances that satisfy a filter that includes join predicates (4.11)
NOTE In this International Standard, the object instances will be feature (4.7) instances.

local resource
resource that is under the direct control of a system
NOTE In this International Standard, the system is a web feature service and the resource is held in a data store that is directly controlled by that service.

locator attribute
attribute (4.1) whose values is a reference to a local resource (4.13) or remote resource (4.20)
NOTE In XML, this attribute is commonly called an href and contains a URI reference to the remote resource (see W3C XLink).

Multipurpose Internet Mail Extensions (MIME) type
media type and subtype of data in the body of a message that designates the native representation (canonical form) of such data
[IETF RFC 2045:1996]

namespace <XML>

collection of names, identified by a URI reference which are used in XML documents as element (4.6) names and attribute (4.1) names

[W3C XML Namespaces:1999]

operation

specification of a transformation or query that an object may be called to execute

[ISO 19119:2005, definition 4.3] OGC 09-025r1 and ISO/DIS 19142 6 Copyright © 2010 Open Geospatial Consortium

property

facet or attribute of an object, referenced by a name

[ISO 19143:2010, definition 4.21]

resource

asset or means that fulfils a requirement

[ISO 19143, definition 4.23]

NOTE In this International Standard, the resource is a feature (4.7), or any identifiable component of a feature (e.g. a property of a feature)

remote resource

resource that is not under direct control of a system

NOTE In this International Standard, the system is a web feature service. The resource is not held in any data store that is directly controlled by that service and thus cannot be directly retrieved by the service.

request

invocation of an operation (4.17) by a client (4.2)

[ISO 19128:2005, definition 4.10]

relocate

<reference> update a reference to a resource that has been moved or copied to a new

location

EXAMPLE A server (4.28) is generating a response (4.24) to a GetFeature request (4.21), it has to copy a referenced feature (4.7) into the response document and the server has to "relocate" the original link contained in the referencing feature to the copy placed in the response document.

resolve

retrieval of a referenced resource and its insertion into a server-generated response document

NOTE The insertion may be accomplished by either replacing the reference in-line with a copy of the resource or by relocating the reference to point to a copy of the resource that has been placed in the response document.

response

result of an operation (4.17) returned from a server (4.28) to a client (4.2)

[ISO 19128:2005, definition 4.11]

response model

schema (4.26) defining the properties of each feature (4.7) type that can appear in the response (4.24) to a query operation (4.17)

NOTE This is the schema of feature types that a client (4.2) can obtain using the DescribeFeatureType operation (see Clause 9).

schema

formal description of a model OGC 09-025r1 and ISO/DIS 19142

[ISO 19101:2002, definition 4.25]

NOTE In general, a schema is an abstract representation of an object's characteristics and relations to other objects. An XML schema represents the relationship between the attributes (4.1) and elements (4.6) of an XML object (for example, a document or a portion of a document).

schema <XML Schema>

collection of schema (4.26) components within the same target namespace (4.16)

[ISO 19136:2007, definition 4.1.54]

EXAMPLE Schema components of W3C XML Schema are types, elements (4.16), attributes (4.1), groups, etc.

server

particular instance of a service (4.29)

[ISO 19128:2005, definition 4.12]

service

distinct part of the functionality that is provided by an entity through interfaces (4.10)

[ISO 19119:2005, definition 4.1]

service metadata

metadata describing the operations (4.17) and geographic information available at a server (4.28)

[ISO 19128:2005, definition 4.14]

traversal

<XML>

using or following an XLink link for any purpose

[W3C XLink:2001]

tuple

ordered list of values

[ISO 19136:2007, definition 4.1.63]

NOTE In this International Standard, the order list will generally be a finite sequence for features (4.7), each of a specific feature type.

Uniform Resource Identifier

unique identifier for a resource, structured in conformance with IETF RFC 2396

[ISO 19136:2007, definition 4.1.65]

NOTE The general syntax is <scheme>::<scheme-specified-part>. The hierarchical syntax with a namespace (4.16) is <scheme>://<authority><path>?<query> OGC 09-025r1 and ISO/DIS 19142

Abbreviated terms

CEOP Critical Earth Observation Priorities

CEOS Committee on Earth Observation Satellites

CGI Common Gateway Interface

CIM Core ISO Metadata

CRS Coordinate Reference System

CSR Components and Services Registry

DCP Distributed Computing Platform

DCP Distributes Computer Platforms

DSTF Data Sharing Task Force

DTD Document Type Definition

EO Earth Observation

EOP Earth Observation Product

EPSG European Petroleum Survey Group

FESFilter Encoding Specification

GCI CTGEOSS Common Infrastructure Coordination Team

GEO Group on Earth Observations

GEOSS Global Earth Observing System of Systems

GIGAS Project Global Earth Observing System of Systems

GML Geography Markup Language

HTTP Hypertext Transfer Protocol

HTTPS Secure Hypertext Transfer Protocol

ILAF OGC

ISO International Organisation for Standardisation

IETF Internet Engineering Task Force

KVP Keyword-value pairs

MIME Multipurpose Internet Mail Extensions

OGC Open Geospatial Consortium

OWS OGC Web Service

PSC The MapServer Project Steering Committee

RPC Remote Procedure Call

REST Representational State Transfer

SDI Spatial Data Infrastructure (1990's)

SIF Standards and Interoperability Forum

SQL Structured Query Language

SOAP Simple Object Access Protocol

UML Unified Modelling Language

URI Uniform Resource Identifier

URL Uniform Resource Locator

URN Uniform Resource Name

VSP Vendor Specific Parameter

WFS Web Feature Service

WMS Web Map Service

WCS Web Coverage Service

WSDL Web Services Description Language

W3C World Wide Web Consortium

XML Extensible Markup Language

Web Aliases Web-accessible directories

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