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。
RDF Namespace ¶
RDF namespace (xmlns:rdf): http://www.w3.org/1999/02/22-rdf-syntax-ns#
RDF namespace (xmlns:rdfs): http://www.w3.org/2000/01/rdf-schema#
RDF extension and MIME type ¶
The recommended extension for RDF files is .rdf However, the extension .XML Is often used to be compatible with older XML parsers.
MIME type: “application/rdf+xml” .
RDFS / RDF class ¶
element | Class | Subclass |
|---|---|---|
Rdfs:Class | All classes | |
Rdfs:Datatype | Data types | Class |
Rdfs:Resource | All resources | Class |
Rdfs:Container | Containers | Resource |
Rdfs:Literal | Literal values (text and numbers) | Resource |
Rdf:List | Lists | Resource |
Rdf:Property | Properties | Resource |
Rdf:Statement | Statements | Resource |
Rdf:Alt | Containers of alternatives | Container |
Rdf:Bag | Unordered containers | Container |
Rdf:Seq | Ordered containers | Container |
Rdfs:ContainerMembers hipProperty | Container membership properties | Property |
Rdf:XMLLiteral | XML literal values | Literal |
RDFS / RDF attribute ¶
element | Domain | Range | Description |
|---|---|---|---|
Rdfs:domain | Property | Class | Resource domain |
Rdfs:range | Property | Class | Scope of resources |
Rdfs:subPropertyOf | Property | Property | This attribute is a child of an attribute |
Rdfs:subClassOf | Class | Class | A resource is a subclass of a class |
Rdfs:comment | Resource | Literal | Human readable resource description |
Rdfs:label | Resource | Literal | Human readable resource tag (name) |
Rdfs:isDefinedBy | Resource | Resource | Definition of resources |
Rdfs:seeAlso | Resource | Resource | Additional information about resources |
Rdfs:member | Resource | Resource | Members of the resource |
Rdf:first | List | Resource | |
Rdf:rest | List | List | |
Rdf:subject | Statement | Resource | A resource subject stated by RDF |
Rdf:predicate | Statement | Resource | Predicates for resources stated in a RDF |
Rdf:object | Statement | Resource | A resource object stated by RDF |
Rdf:value | Resource | Resource | Value attribute |
Rdf:type | Resource | Class | A resource is an instance of a class |
RDF attribute ¶
element | Domain | Range | Description |
|---|---|---|---|
Rdf:about | Define the resources described | ||
Rdf:Description | Container for resource description | ||
Rdf:resource | Define a resource to determine an attribute | ||
Rdf:datatype | Define the data type of an element | ||
Rdf:ID | Define the ID of an element | ||
Rdf:li | Definition list | ||
Rdf:_n | Define a node | ||
Rdf:nodeID | Define the ID of the element node | ||
Rdf:parseType | Define how elements should be parsed | ||
Rdf:RDF | The root of an RDF document | ||
Xml:base | Defines the basis of XML | ||
Xml:lang | The language that defines the content of an element | ||
Rdf:aboutEach | (delete) | ||
Rdf:aboutEachPrefix | (delete) | ||
Rdf:bagID | (delete) |
The one described as “deleted” is the most recently deleted element from the RDF standard.