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。
Other miscellaneous data types include Boolean, base64Binary, hexadecimal, floating point, double, anyURI, anyURI, and NOTATION. Boolean data properties are used to specify true or false values. Here is an example of a logical declaration in a scheme: The elements in the document should look like this: 注意： Legal Boolean values are true, false, 1 (for true), and 0 (for false). Binary data types are used to express data in binary form. We can use two binary data types: Base64Binary (Base64 encoded binary data) HexBinary (hexadecimal encoded binary data) Here is an example of a hexBinary declaration in a scheme: The anyURI data type is used to specify URI. Here is an example of an anyURI declaration in a scheme: The elements in the document should look like this: 注意： If a URI contains spaces, replace them with% 20. Name Description AnyURI Base64Binary Boolean Double Float HexBinary NOTATION QName Restrictions that can be used with miscellaneous data types: Enumeration (this constraint cannot be used by Boolean data types * ) Length (this constraint cannot be used by Boolean data types) MaxLength (this constraint cannot be used by Boolean data types) MinLength (this constraint cannot be used by Boolean data types) Pattern WhiteSpace * translator’s note: constraint refers to constraint. Boolean data type (Boolean Data Type) ¶
<xs:attribute name="disabled" type="xs:boolean"/>
<prize disabled="true">999prize>
Binary data type (Binary Data Types) ¶
<xs:element name="blobsrc" type="xs:hexBinary"/>
AnyURI data type (AnyURI Data Type) ¶
<xs:attribute name="src" type="xs:anyURI"/>
<pic src="http://www.w3schools.com/images/smiley.gif" />
Miscellaneous data types ¶
Qualification of miscellaneous data types (Restriction) ¶