Lists all videos that have the specified tag.
method: youtube.videos.list_by_tag
(only needed as an explicit parameter for REST calls)
dev_id: Developer ID. Please request one if you don't already have one.
tag: the tag to search for
(optional) page: the "page" of results you want to retrieve (e.g. 1, 2, 3)
(optional) per_page: the number of results you want to retrieve per page (default 20, maximum 100)
<video_list>
<video>
<author>youtuberocks</author>
<id>k0gEeue2sLk</id> <!-- this ID can be used with youtube.videos.get_details -->
<title>My First Motion Picture</title>
<length_seconds>16</length_seconds> <!-- length of video -->
<rating_avg>3.75</rating_avg>
<rating_count>10</rating_count>
<description>This is the video description shown on the YouTube site.</description>
<view_count>170</view_count>
<upload_time>1121398533</upload_time> <!-- UNIX-style time, secs since 1/1/1970 -->
<comment_count>1</comment_count> <!-- how many comments does this video have? -->
<tags>feature film documentary</tags>
<url>http://www.youtube.com/watch?v=k04Eeue24Lk</url>
<thumbnail_url>http://static.youtube.com/get_still?video_id=k04Eeue24Lk</thumbnail_url>
</video>
<video>
... another video ...
</video>
</video_list>