Schema to parse picture information

I wish to use xml to hold a picture in a web page, basically my first thought was schemas anyURI data type. But how would i go about using it? My first idea was to just have a simple anyURI element containing the source of the picture, then some sort of foreach command in the schema to print some javascript code for inserting a picture, somehow using the information stored in the anyURI <picture> tag....any ideas?
thanks.