I think in some species of XHTML, <br /> tags must always be inside other parent elements, so if <br /> is just sitting by itself, consider changing it to <p><br /></p> -- though I think you must also consider whether you really shouldn't instead simply add to the margins either below the previous paragraph or above the next paragraph in such cases (e..g, margin-bottom: 2ex; for the CSS for the paragraph above).
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