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