Google has invented two styles (microformat and RDF (Resource Development Framework)) of markup to embed in your HTML (Hypertext Markup Language) pages to provide a summary for a web page. The summary is displayed to the user when the search engine hits on that page. The examples at Google are too small to read. Try clicking them. They will expand to pngimages, which unfortunately you cannot copy/paste. The examples have no comments, so it is not clear which parts you are supposed to copy and which parts to modify.
A simpler scheme would be to use the first sentence (not counting headings) on the page as the default summary.
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