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In the first line 'locked=true' means you cannot delete the Blog Posts widget through the Page Elements tab. If you change this to locked='false' you will be able to remove this widget through the Page Elements tab but then you will not be able to add posts to the blog. The second line is common to all widgets. Widget content is contained in "includable" sections. Each widget must have one includable with id='main'. This will usually contain most or all of the content that will display for this widget.