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Asked: 2026-05-28T05:57:49+00:00

<?xml version=1.0 encoding=UTF-8?> <beans xmlns=http://www.springframework.org/schema/beans xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xmlns:aop=http://www.springframework.org/schema/aop xmlns:context=http://www.springframework.org/schema/context xsi:schemaLocation=http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.1.xsd>

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<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.1.xsd">

  <context:component-scan
      base-package="com.springinaction.chapter01.knight" />

</beans>

The above example shows an example of an XML file with several namespaces. What is the purpose of these namespaces and most importantly why do they work even where there is no Internet connection?

I think the second bit that starts with xsi:schemaLocation contains the XML schema files which are used to validate the structure of the XML document. How come these still work if I run the application that uses this configuration file on a machine that is not on a network? Are the URLs somehow aliases to JAR files?

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1 Answer

  1. Editorial Team

    Let us assume we have this XML document.

    <?xml version="1.0" encoding="UTF-8"?>
<html>
      <body>
        Your text here
      </body>
      <body>
        <height>182 cm</height>
        <weight>83 kg</weight>
      </body>
</html>

    It includes HTML which has a body tag with a semantic meaning for a HTML renderer. It also has another body tag which carries information about a specific person. A namespace defines a semantic scope for this tag. Without a namespace(as in the example provided), it is impossible for a parser to tell the difference because they are syntactically the same.

    Here is the semantically correct version of the same document:

    <?xml version="1.0" encoding="UTF-8"?>
<html:html xmlns:html="http://www.w3.org/TR/xhtml1/">
  <html:body>
    Your text here
  </html:body>
  <human:body xmlns:human="http://www.example.com/human/">
    <human:height>182 cm</human:height>
    <human:weight>83 kg</human:weight>
  </human:body>
</html:html>

    Thus thanks to namespaces we do not have worry about conflicting tags with different meanings.

    The namespace URIs themselves are never actually resolved, and are arbitrary (thus you can use them offline).

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