最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
It describes a web service, actions that can be performed, and related messages. You can put Request-response is the most common type of operation, but WSDL defines fourtypes: Types Define One-way This action accepts a message, but does not return a response. Request-response This operation accepts a request and returns a response Solicit-response This action sends a request and waits for a response. Notification This action sends a message, but does not wait for a response. An example of an one-way operation: In this example, the port “glossaryTerms” defines an one-way operation named “setTerm”. This “setTerm” operation accepts input from the new glossary item message,which uses a message named “newTermValues” with the input parameters “term” and “value”. However, no output is defined for this operation. One In this example, the port “glossaryTerms” defines a request-response operation named “getTerm”. The “getTerm” operation requests an input message named “getTermRequest”with a parameter named “term” and returns an output message named “getTermResponse” with a parameter named “value”. 6.4.1. WSDL port ¶
6.4.2. Operation type ¶
6.4.3. One-Way operation ¶
Example ¶
<messagename="newTermValues"><partname="term"type="xs:string"/><partname="value"type="xs:string"/>message><portTypename="glossaryTerms"><operationname="setTerm"><inputname="newTerm"message="newTermValues"/>operation>portType>
6.4.4.
Request-Response operation ¶ request-response examples of operations: Example ¶
<messagename="getTermRequest"><partname="term"type="xs:string"/>message><messagename="getTermResponse"><partname="value"type="xs:string"/>message><portTypename="glossaryTerms"><operationname="getTerm"><inputmessage="getTermRequest"/><outputmessage="getTermResponse"/>operation>portType>