extracting semantic text features from, the media content and {TAIL ~ the URL}, wherein the extracting the semantic text features is determined according to a set of extraction rules, wherein {HEAD ~ the set} of extraction rules comprises at least one rule specifying surrounding text be within a threshold semantic distance from a piece of the media content 
extracting semantic text features from , the media content and { TAIL ~ the URL } , wherein the extracting the semantic text features is determined according to a set of extraction rules , wherein { HEAD ~ the set } of extraction rules comprises at least one rule specifying surrounding text be within a threshold semantic distance from a piece of the media content
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