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[extractor/common] Document ie_key in url results
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@ -174,9 +174,10 @@ class InfoExtractor(object):
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_type "url" indicates that the video must be extracted from another
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location, possibly by a different extractor. Its only required key is:
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"url" - the next URL to extract.
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Additionally, it may have properties believed to be identical to the
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resolved entity, for example "title" if the title of the referred video is
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The key "ie_key" can be set to the class name (minus the trailing "IE",
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e.g. "Youtube") if the extractor class is known in advance.
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Additionally, the dictionary may have any properties of the resolved entity
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known in advance, for example "title" if the title of the referred video is
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known ahead of time.
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