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 at least one rule specifying {HEAD ~ surrounding text} be within {TAIL ~ a threshold semantic distance} from a piece of the media content 
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 at least one rule specifying { HEAD ~ surrounding text } be within { TAIL ~ a threshold semantic distance } from a piece of the media content
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