TJS-related Glossary

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Glossary


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attribute data
A set of values that describes some aspect of a
geographic framework. Attribute data are referenced to an set of geographic features without including the spatial locations of those features. Geographic data attributes are normally tabular data (such as population counts) that refer to a known framework (such as provinces), where the elements (the provinces) are referenced by a unique identifier (such as the province name). Population, temperature, and income are all examples of attribute data that could reference a geographic framework.

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capabilities
Metadata describing the operations available from a service instance.

client
Software component that can invoke an
operation from a server.

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datastore
A software component for persistently storing and managing the spatial and/or non-spatial properties of geographic features. The datastore can be a SQL relational database, flat files, a GIS database, a static XML file, etc.

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framework data
A
GIS dataset that contains spatial coordinate information for a geographic framework.

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GDAS (Geographic Data Attribute Set)
An
XML-based data exchange format that contains attribute data and extensive metadata. GDAS is the data exchange format supported by TJS.

geographic framework
A partitioning of the surface of the earth into a set of management units. Municipalities, postal codes, telephone area codes, ecoregions, and watersheds are all examples of geographic frameworks.
GIS datasets that define the coordinates of geographic frameworks are known as framework data.

GIS
Geographic Information System.

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HTTP (HyperText Transfer Protocol)
HTTP is the protocol used between a Web browser and a server to request a document and transfer its contents. The specification is maintained and developed by the World Wide Web Consortium.

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interface
Specification of the mechanism that allows a
client to access a web service.

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map
Pictorial representation of geographic data.

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OGC (Open Geospatial Consortium, Inc.)
The OGC is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services. Through member-driven consensus programs, OGC works with government, private industry, and academia to create open and extensible software application programming interfaces for geographic information systems (GIS) and other mainstream technologies.

operation
Specification of a transformation or query that an object may be called to execute.

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request
Invocation of a
web service operation by a client.

response
Result of an
operation returned from a web service to a client.

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server
An implementation of a service (see
service instance).

service
A software component accessible through a web server that provides functionality through a standardized set of
interfaces (see web service).

service instance
Specific physical implementation of a web service; a live software component on which a
client can invoke an operation.

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TJS (Table Joining Service)
A
web service that provides a standardized method of accessing and/or joining attribute data to its associated geographic framework.

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web server
A program that services
HTTP requests. For example, the Apache program is a web server. A web server can support the delivery of a web service.

web service
A software component accessible through a
web server that provides functionality through a standardized set of interfaces (see service).

WFS (Web Feature Service)
A WFS allows a client to perform data manipulation operations on a set of geographic features. Data manipulation operations include the ability to get or query features based on spatial and non-spatial constraints, and create/delete/update features.

WMS (Web Map Service)
A WMS allows a client to get maps of geospatial data and gain detailed information on specific features shown on the map. A "map" here refers to a visual representation of geospatial data, not the geospatial data itself.

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XML (eXtensible Markup Language)
XML is a text markup language for the interchange of structured documents and data on the Web, intended to deliver information, not just pages. It is a subset of SGML and lets Web developers and designers create customized tags that offer greater flexibility in organizing and presenting information.

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