java Spring bean DTD 和 XMLNS
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Spring beans DTD and XMLNS
提问by user962206
When i am creating a spring project I always have problem with XLMNS. what is exactly XMLNS? what are these actually?
当我创建一个 spring 项目时，我总是遇到 XLMNS 问题。什么是 XMLNS？这些实际上是什么？
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
And where can I get the references for these? (resource of xmlns:xsi and xsi:schemeLocation.) is there any online manual for these? I can't seem to find them.
我在哪里可以获得这些参考资料？（xmlns:xsi 和 xsi:schemeLocation 的资源。）有没有这些的在线手册？我似乎找不到他们。
NOTEWhen I said references I meant the proper urls for them
注意当我说引用时，我指的是它们的正确网址
UPDATED
更新
Where can I see the XML namespaces for Spring beans, Spring Transactions, Spring MVC and such? and its schema locations?
我在哪里可以看到 Spring bean、Spring Transactions、Spring MVC 等的 XML 命名空间？及其架构位置？
回答by Solubris
There is a good explanation here: what is the use of xsi:schemaLocation?
这里有一个很好的解释： xsi:schemaLocation 有什么用？
Here is springs docs on xsd config: http://static.springsource.org/spring/docs/current/spring-framework-reference/html/xsd-config.html
这是关于 xsd 配置的 springs 文档：http: //static.springsource.org/spring/docs/current/spring-framework-reference/html/xsd-config.html
NOTE: spring now recommend not to include the version number in the xsd unless specifically required, so you should have:
注意：spring 现在建议不要在 xsd 中包含版本号，除非特别需要，所以你应该：
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"
and not:
而不是：
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"
"xmlns" defines the name space for the current element.
“xmlns”定义当前元素的命名空间。
"xmlns:aop" defines the name space for elements within the current element, that have a prefix of "aop:"
“xmlns:aop”定义当前元素中元素的命名空间，前缀为“aop:”
回答by JQ-
These lines set up the namespaces for your XML document. Depending on what tags you are using in your XML file, you'll need the namespaces at the top (and references to the correct schemas) in order for the XML to be valid.
这些行为您的 XML 文档设置命名空间。根据您在 XML 文件中使用的标签，您需要顶部的命名空间（以及对正确模式的引用）以使 XML 有效。
For example, if you are using the <aop/>tag in your bean definitions, you will need to reference the aop schema at the top of the file: xmlns:aop="http://www.springframework.org/schema/aop"If you aren't using that tag, you don't need that there.
例如，如果您<aop/>在 bean 定义中使用标签，则需要引用文件顶部的 aop 模式：xmlns:aop="http://www.springframework.org/schema/aop"如果您不使用该标签，则不需要该标签。
For any namespaces you import, make sure you add a reference to the schema in the "xsi:schemaLocation" tag, like this: xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
对于您导入的任何命名空间，请确保在“xsi:schemaLocation”标记中添加对架构的引用，如下所示： xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
I would recommend checking out a sample Spring application since it should have the bare minimum that you need to get something running.
我建议查看一个示例 Spring 应用程序，因为它应该具有运行某些东西所需的最低限度。
回答by Nizzo
As far as answering the 'where is it documented', I think it depends per project. In the case of Spring, the project documentation does contain a reference to this information. As an example, check out the xsd-config section for Spring Framework 3.2.x: Appendix E. XML Schema-based configuration
至于回答“它记录在哪里”，我认为这取决于每个项目。对于 Spring，项目文档确实包含对此信息的引用。例如，查看 Spring Framework 3.2.x 的 xsd-config 部分：附录 E. 基于 XML 模式的配置
