问题描述
我被迫与外部 XML 作斗争，我不明白 XML 文件中的命名空间和前缀之间有什么区别.我的意思是，我正在使用命名空间和标签名称来通过 Linq 库获取此文件中的值.但我不知道它们之间的区别.
I am forced to fight with an external XML and I do not understand what is the difference between namespace and prefix in a XML file. I mean, I am using namespace and name of the label to get a value in this file with Linq library. But I do not know the difference between these.
-<a:RoutePointsMeteoData z:Id="31" z:Size="10">
-<b:anyType z:Id="32" i:type="a:WaypointFLMeteoData">
<a:DevISA>0</a:DevISA>
<a:DisplayTemperatureType>IsaDev</a:DisplayTemperatureType>
<a:RelatedRoutePointName>1739276a822f8a919b</a:RelatedRoutePointName>
<a:TemperatureSource>NotDefined</a:TemperatureSource>
<a:WindDirection>0</a:WindDirection>
<a:WindSource>NotDefined</a:WindSource>
<a:WindSpeed>0</a:WindSpeed>
有人能告诉我在标签中使用前缀的主要目的吗?例如:
Someone could tell me the main objective of use prefix in labels? For example:
<a:DevISA>0</a:DevISA>
这样做的目的是什么:?这是一种检测标签的显着特征吗?
What could be the purpouse of this a:? Is this a kind of distinctive feature to detect a label?
推荐答案
XML 命名空间前缀是完整 XML 命名空间的缩写.
因为命名空间旨在区分不合格的 XML 名称，所以命名空间本身最好足够长，以便在添加到不合格名称之前创建一个词法上不同的新名称.与 URI 所有权一致的组织所有权是一个很好的属性，它也往往会增加命名空间长度.
Because namespaces are meant to differentiate unqualified XML names, it's better that the namespaces themselves be sufficiently long to create a lexically distinct new name when prepended to the unqualified names. Organizational ownership that's aligned with URI ownership is a nice property that also tends to increase namespace length.
为了避免将完整的 XML 名称空间与不合格的 XML 名称笨拙地串联在一起，引入了一种缩写机制，
To avoid unwieldy concatenation of a full XML namespace with an unqualified XML name, an abbreviation mechanism was introduced,
xmlns:a="http://example.com/some/full/namespace/name"
允许将 RoutePointsMeteoData 作为 a:RoutePointsMeteoData 而不是 {http://example.com/some/full/命名空间/名称}RoutePointsMeteoData.(这种替代符号，称为 Clark Notation，不是标准化的——它不兼容直接使用 XML，但常用于元描述、JAXP API 规范中的参数名称等)
allowing RoutePointsMeteoData to be written in this namespace as a:RoutePointsMeteoData rather than, say, {http://example.com/some/full/namespace/name}RoutePointsMeteoData. (This alternative notation, known as Clark Notation, is not standardized – it's not compatible with XML directly, but is commonly used in meta descriptions, parameter names in JAXP API spec, etc)
进一步说明:
- XML 命名空间前缀本身是任意的；只有通过他们绑定到他们派生的完整 XML 命名空间名称重要性.
- XML 命名空间前缀必须声明，以便将 XML 文档视为 命名空间格式良好.
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