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transport of dangerous goods and risk management - Kirilo Savić

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TRANSPORT OF DANGEROUS GOODS AND RISK MANAGEMENT 187after processing, generates <strong>and</strong> sends a response to a client.WFS service supports the following operations:ooooo provides metadata about services, available types <strong>of</strong> geo-objects <strong>and</strong> operationsthat may be made <strong>of</strong> them; describes the structure <strong>of</strong> the types <strong>of</strong> geo-objects: APPLICATION GMLschema type <strong>of</strong> geo-objects; allows users to retrieve geo-object through the specification <strong>of</strong> attributes <strong>and</strong>constraints defined through spatial or alphanumeric query using the OGC Filter Language; allows locking <strong>of</strong> one or more types <strong>of</strong> geo-objects in order to carry outtransactions; allows creating, updating <strong>and</strong> deletion <strong>of</strong> geo-objects. It service transaction requests.Transaction requests are composed <strong>of</strong> operations that modify the geo-objects in the database: insert, update, delete.Example URL for the request http://www.someserver.com/wfs.cgi?SERVICE = WFS &VERSION = 1.1.0 &REQUEST = DescribeFeatureType &TYPENAME = TreesA_1MOGC Filters allows you to define spatial <strong>and</strong> alphanumeric queries. Composed <strong>of</strong> terms thatsupport the following operations:arithmetic (+, -, *, /),comparison operations (, = ...),logical (AND, OR ...),Space (BBOX; within; INTERSECT ...),feature ID.When is required by the WMS users, it takes the appropriate layers in the WFS <strong>and</strong> thus is obtained as aset <strong>of</strong> map layers. The client application can directly access the WFS with the request for specific content. WFSworks mainly with vector data types (point, line, polygon). In Figure 7. is shown overview <strong>of</strong> the schematicapproach <strong>of</strong> the WFS or WMS application:APPLICATIONWFSLAYERSWMSMap as group <strong>of</strong>layersGMLGEOSPATIALDATABASEFigure 7. Access to WFS

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