About package Element is Struts ?

The package Element

All the actions are grouped into packages(modules) because Struts has been designed with modularity in mind. A typical struts.xml file can have one or many packages: 

<struts> 

<package name="package-1" namespace="namespace-1" extends="struts-default"> 

<action name="..."/>

<action name="..."/>

 ...

</package> 

<package name="package-2" namespace="namespace-2"  extends="struts-default">

<action name="..."/> 

<action name="..."/> 

... 

</package>

 ... 

<package name="package-n" namespace="namespace-n" extends="struts-default">

<action name="..."/>

<action name="..."/>

 ... 

</package>

</struts>

Attribute                                Mandatory                         Default Value

  name                                      Yes                                     ___

  namespace                             No                                     "/"

  extends                                  No(but important)             ___(but usually struts-default)

Note:-

If the namespace attribute has a non-default value:-

* Then namespace must be added to the URI that invokes the actions in the package.

For example, with default namespace, URI is as below 

/context/actionName.action

but with non-default namespace, URI is 

/context/namespace/actionName.action

**  A package element almost always extends the struts-default package defined in struts-default.xml.

 By doing so, all actions in the package can use the result types and interceptors registered in struts-default.xml.