Content is believed to be the heart and soul of a webpage and there are various dimensions to content which we usually fail to consider. Content not only includes text, but also other forms such as images and video. Although text can be easily indexed by the search engines, images and videos are hard to get indexed. Hence, unless you optimize them, search engines cannot value your content. I guess we are in a age of Multidimensional content and hence using mere text can lead us not very far.