XML 架构：xsd:attribute 的默认类型是什么？
XML Schema: what's the default type of an xsd:attribute?
在 EBUCore 模式 (http://en.wikipedia.org/wiki/Metadata_standards) 中有一个名为 'version' 的属性定义为
<attribute name="version" default="1.5">
<annotation>
<documentation> The version of the schema for e.g. OAI management.</documentation>
</annotation>
</attribute>
如您所见，没有为它定义 'type'，我想知道它的默认类型是什么 - anyType、anySimpleType、string、float, double, ...
W3C 规范 (http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#section-Built-in-Simple-Type-Definition) 有点难通过：
The ·simple ur-type definition· is considered to have an unconstrained
lexical space, and a value space consisting of the union of the value
spaces of all the built-in primitive datatypes and the set of all
lists of all members of the value spaces of all the built-in primitive
datatypes.
所以，也许有人可以告诉我，将该属性映射到哪种类型？
属性默认类型
XSD中XML属性的类型默认为xsd:anySimpleType.
哪里这么说的？
3.2.2 XML Representation of Attribute Declaration Schema Components
The simple type definition corresponding to the element
information item in the [children], if present, otherwise the simple
type definition ·resolved· to by the ·actual value· of the type
[attribute], if present, otherwise the ·simple ur-type definition·.
然后，你可以找到简单的ur类型定义和xsd:anySimpleType之间的联系 here:
[Definition:] The simple ur-type definition is a special restriction
of the ur-type definition whose name is anySimpleType in the XML
Schema namespace. anySimpleType can be considered as the ·base type·
of all ·primitive· datatypes.
是的，人们希望它更容易确定。
元素默认类型
XML元素的类型XSD中的默认为ur-anytype.
在 EBUCore 模式 (http://en.wikipedia.org/wiki/Metadata_standards) 中有一个名为 'version' 的属性定义为
<attribute name="version" default="1.5">
<annotation>
<documentation> The version of the schema for e.g. OAI management.</documentation>
</annotation>
</attribute>
如您所见，没有为它定义 'type'，我想知道它的默认类型是什么 - anyType、anySimpleType、string、float, double, ...
W3C 规范 (http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#section-Built-in-Simple-Type-Definition) 有点难通过：
The ·simple ur-type definition· is considered to have an unconstrained lexical space, and a value space consisting of the union of the value spaces of all the built-in primitive datatypes and the set of all lists of all members of the value spaces of all the built-in primitive datatypes.
所以，也许有人可以告诉我，将该属性映射到哪种类型？
属性默认类型
XSD中XML属性的类型默认为xsd:anySimpleType.
哪里这么说的？
3.2.2 XML Representation of Attribute Declaration Schema Components
The simple type definition corresponding to the element information item in the [children], if present, otherwise the simple type definition ·resolved· to by the ·actual value· of the type [attribute], if present, otherwise the ·simple ur-type definition·.
然后，你可以找到简单的ur类型定义和xsd:anySimpleType之间的联系 here:
[Definition:] The simple ur-type definition is a special restriction of the ur-type definition whose name is anySimpleType in the XML Schema namespace. anySimpleType can be considered as the ·base type· of all ·primitive· datatypes.
是的，人们希望它更容易确定。
元素默认类型
XML元素的类型XSD中的默认为ur-anytype.