XML Schema 参考手册 完整 XML Schema 参考手册 The list element defines a collection of individual simpleType definitions. 父元素： SimpleType (? Symbol declaration an element can appear zero or once in a list element. ) Attribute Description Id Optional. Specifies the unique ID of the element. ItemType The name of the built-in data type or simpleType element defined in this schema (or other schema indicated by the specified namespace). The simpleType element that contains the list element is derived from the simple type specified by the list value. The list value must be a qualified name (QName). This attribute is not allowed if the content contains a simpleType element, otherwise it is required. Any attributes Optional. Specifies any other attributes with the non-schema namespace. The following example shows a simple type that is a column of integers: 注意： Spaces are used as delimiters for list items. The following example shows a simple type for a column of strings: XML Schema 参考手册 完整 XML Schema 参考手册
In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress. Definition and usage ¶
Element information ¶
Grammar ¶
(annotation?,(simpleType?))
Example 1 ¶
Example 2 ¶
Principles, Technologies, and Methods of Geographic Information Systems
102