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acceptable quality level (AQL)
threshold value applied to the results of testing data quality to determine whether the data meets criteria determined from a standard, specification or user requirements
aggregated AQL
acceptable quality level for aggregated results from a number of tests, e.g. 100% correct
Coordinate Reference System
a coordinate system that is related to an object by a datum [ISO 19111]
CRS
Coordinate Reference System
CSW
Catalogue Services for the Web. Http protocol request/respond binding for OGC Catalogue Service.
Data Provider
the organisation that creates the data and supplies the data for web publication, along with its metadata.
Note: for INSPIRE data, the Public Authority with the statutory obligation under the INSPIRE regulations.
Data Publisher
the organisation that publishes the data on the web and supplies data services to data users
data resource
dataset, collection of datasets or service supplying data
dataset
identifiable collection of data [ISO 19101]
dataset series
collection of datasets sharing the same specification, e.g. a 1:1250 scale map series [ISO 19115]
discovery metadata
information about a data or service resource, used to discover and access its suitability for sharing or re-use.
DMS
Discovery Metadata Service.
Note: one of a number of business services associated with the UK Location Information Infrastructure. Implemented by the CSW interface at http://csw.data.gov.uk/geonetwork/
domain
set of allowable values
DTD
Document Type Definition
Note: DTD is an XML schema language which defines the legal building blocks of an XML document. It is not relevant in the context of GEMINI2 metadata instances where _XSD_ schemas are used to define the structure of XML documents.
EDEN
l’Equipe D’Experts en Normalisation
Note: a collaborative workspace for standardisation in the domain of geographic information. See http://eden.ign.fr/welcome
enumerated list
set of values, each of which is identified by a code
EPSG
European Petroleum Survey Group (defunct but the abbreviation is retained in the name of the EPSG Geodetic Parameter Dataset). Since 2005 _OGP_ Surveying and Positioning Committee.
Note: examples are given of the use of EPSG URIs in _metadata instances_. This does not imply that the EPSG registry is the _de jure_ registry of geodetic parameters for UK Location.
GEMET
General Multilingual Environmental Thesaurus.
Note: developed by the European Topic Centre for the European Environment Agency.
Note: currently published and managed by the European Environmental Information and Observation Network.
Note: GEMET can be browsed and searched on-line, accessed through web services or downloaded as HTML or SKOS files, see http://www.eionet.europa.eu/gemet
GEMINI2
the UK discovery metadata profile of ISO 19115.
Note: in this document the term GEMINI2 means version 2.2 of UK GEMINI.
geographic identifier
label or code that identifies a location [adapted from ISO 19112]
GML
Geography Markup Language [ISO 19136]
granularity
resolution in terms of density or frequency
INSPIRE
infrastructure for Spatial Information in Europe
ISO
International Organisation for Standardisation
ISO/TC 211
The committee is responsible for standards such as ISO 19115, ISO 19136 and ISO 19139.
Notes: ISO Technical Committee 211 is responsible for standardisation in the field of digital geographic information. The home page of ISO / TC 211 is http://www.isotc211.org/
location
identifiable geographic place
metadata
data about data [ISO 19115]
metadatabase
collection of metadata about a set of data resources
metadata element
individual item of metadata relating to a data resource, e.g. Extent, Topic
metadata instance
physically instantiated metadata.
Note: in the context of this document a metadata instance will be an _XML document_ conforming to ISO / TS 19139 and other associated standards.
metadata item
a top level metadata concept in the UK GEMINI standard. Title, for example, is a metadata item.
Note: metadata items may comprise sub-items.
metadata service
service that supplies information about data resources
metadataset
identifiable set of metadata relating to a single data resource
OGC
Open Geospatial Consortium.
Note: an industry consortium of companies, government agencies and universities developing publicly available interface standards to geo-enable the Web, wireless, location-based services, and mainstream IT. See http://www.opengeospatial.org/
OGP
International Association of Oil and Gas Producers
profile
set of one or more base standards or subsets of base standards for a particular application
quality assessment
review of quality of a data resource
quality assurance
process to ensure that quality is of an acceptable level
quality control
process of checking items to ensure that they are of an acceptable level of quality
quality management
overall process for assessing and controlling quality
quality result
value of a quality measure
Schematron
a language for making assertions about patterns in XML documents; ISO 19757 Document Schema Definition Language
service
application that provides information and /or functionality to other applications [adapted from Draft Implementing Rules for INSPIRE Transformation Services]
SRS
Spatial Reference System.
Note: a system for specifying position in the real world [ISO 19112]
UK Information Infrastructure
Infrastructure for the publication of location information as part of the implementation of the UK Location Strategy. Incorporates the UK member state implementation of INSPIRE.
UK Location Coordination Unit
legal entity for the day-to-day coordination and management of the UK Location Information Infrastructure and the UK member state element of INSPIRE.
UKLII
UK Location Information Infrastructure
universe of discourse
view of the real or hypothetical world that includes everything of interest
URI
Uniform Resource Identifier.
Notes: URIs identify resources and may allow access to representations of the resources. A URL is a URI. An overview of W3C materials relating to address can be found at http://www.w3.org/Addressing/
URL
Uniform Resource Locator. Specifies where an identified resource is available on the Web and the mechanism for retrieving it.
UTC
Coordinated Universal Time
UUID (or GUID)
Universally (or Global) Unique IDentifier (UUID) is a unique 128-bit integer that is represented as a 36 (or 32 ignoring the dashes) character string of hexadecimal numbers.
Note: UUIDs are system generated and ideally a UUID will never be generated twice by any computer in existence.
-
Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
-
Example: 3ce4f380-b394-4e5d-b222-6914ea311156
WAF
a Web Accessible Folder (WAF) is an HTTP accessible directory of files
Note: typically metadata files in XML format in which all files and their time-stamps are visible to a web browser or client. Crawlers are able to parse the file listings and date-time stamps and provide a search interface on these documents.
WMS
Web Mapping Service
WFS
Web Feature Service
XLink
XML Linking Language
Note: used to include metadata element data by-reference rather than by-value.
Note: the XLink specification can be found at http://www.w3.org/TR/xlink/
XML
eXtensible Markup Language
Note: the XML specification can be found at http://www.w3.org/TR/REC-xml/
XML Document
a collection of data represented in XML
XML parser
software component responsible for reading an XML document and dividing it into individual elements and attributes.
Note: parsers will check that an XML document is well-formed. Some parsers will undertake a schema validation.
XSD
XML Schema Definition language.
Note: an XSD is a document written in XML that defines the structure of an XML document.
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