gistfile1.json

{
    "name": "Markdown Editor",
    "root": {
        "parts": [
            {
                "place": "MarkdownLiveViewer",
                "parameters": [
                    
                ]
            }
        ],
        "panels": [
            {
                "width": 600,
                "min_width": 300,
                "position": "west",
                "parts": [
                    {
                        "place": "MarkdownLiveEditor",
                        "parameters": [
                            
                        ]
                    }
                ]
            }
        ]
    }
}

same.in.java

        final PerspectiveDefinition p = new PerspectiveDefinitionImpl();
        p.setName( "Markdown Editor" );

        p.getRoot().addPart( new PartDefinitionImpl( new DefaultPlaceRequest( "MarkdownLiveViewer" ) ) );

        final PanelDefinition westPanel = new PanelDefinitionImpl();
        westPanel.setWidth( 600 );
        westPanel.setMinWidth( 300 );
        westPanel.addPart( new PartDefinitionImpl( new DefaultPlaceRequest( "MarkdownLiveEditor" ) ) );
        p.getRoot().insertChild( Position.WEST, westPanel );

        return p;