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<screens xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/widget-screen.xsd">
       
    <screen name="Mainmain">
        <section>
            <widgets>                           
                   <label text="This is first practice"/>                            
            </widgets>
        </section>
    </screen>

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Step - 3 : For loading the defintion you need to do an entry in your ofbiz-component.xml file like:

<entity-resource type="model" reader-name="main" loader="main" location="entitydef/entitymodel.xml"/>

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Step - 1 :  For extending an entity use

<extend-entity entity-name="">
        <field name="" type=""/>
    </extend-entity>

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