Describe the issue:

Missing "<system>" attribute/property from the documentation in RedHat Developement guide[1]. 

Suggestions for improvement:

- `<system>` attribute is used with "jboss-deployment-descriptor.xml" & it add dependency on the system (or embedding) class loader. 
- In the documentation link [1] section [3.1.8. jboss-deployment-structure.xml]  There is no where defined what does this attibute do.However The detail meaning of all sub attribute/properties like this is actually defined in `xsd` of `jboss-deployment-structure` file which is placed in location of:  "JBoss_Home/docs/schema/jboss-deployment-structure-1_2.xsd"

eg :
~~~
a) "export" :

 <xsd:attribute name="export" type="xsd:boolean" use="optional" default="false">
            <annotation xmlns="http://www.w3.org/2001/XMLSchema">;
                <documentation>
                    Specifies whether this module dependency is re-exported by default (default is "false"). Setting
                    this attribute to true sets the default action for the export filter list to "accept"; leaving it
                    as false sets the default action to "reject". Thus you can still export dependency resources even
                    if this attribute is false by listing explicit paths for the export list.
                </documentation>
            </annotation>
        </xsd:attribute>

 b) "system"

  <xsd:element name="system" type="systemDependencyType">
                <annotation xmlns="http://www.w3.org/2001/XMLSchema">;
                    <documentation>
                        A dependency on the system (or embedding) class loader.
                    </documentation>
                </annotation>
            </xsd:element>

~~~
- So The actual requirement here is that In the documentation We should add some core/major in used attribute like above & for the rest attribute we can point the user to *xsd location.


 [1] https://access.redhat.com/documentation/en-US/JBoss_Enterprise_Application_Platform/6.2/html-single/Development_Guide/index.html#jboss-deployment-structurexml