Define an official DTD DOCTYPE declaration in click.xml
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                 Key: CLK-587
                 URL: https://issues.apache.org/jira/browse/CLK-587
             Project: Click
          Issue Type: Task
          Components: core
    Affects Versions: 2.1.0 RC1
            Reporter: hantsy bai


In a xml file, providing a dtd or schema declaration is not necessary but I 
think it is essential.
Currently the click.xml is lack of Dtd declaration header, like the following.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE click-app PUBLIC
    "-//Apache Software Foundation//DTD Click Configuration 2.1//EN"
    "http://click.apache.org/dtds/click-2.1.dtd";>

<click-app>
....
</click-app>

In the click.xml, providing a doctype declaration(the red section, it is just 
an example) is helpful for IDE. NetBeans IDE can use this declaration to 
determine if this file is a click configuration file, perform xml validation 
and provide basic code completion automatically ( The click for netbeans plugin 
provide basic code completion by the grammar api, and extra code completion is 
provided by Code completion api ,  eg. extra code completion for package, path 
and classname attribute value). 

Please publish an official dtd online in future version.


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