Metadata should be considered broadly in two different classes. There is metadata about a document, an image, a sound file, a video file, or any other sensor file. This meta data is about the whole file. Thus who is the author, or creator of the file, time and place of creation, mechanisms used in creation, and similar information is part of this metadata. Let's call this A-type metadata. The other class of meta data is related to the content of the file. Let's call it C-type metadata. Thus the examples about a number representing annual salary and such information are related to the content of the document. ... Ramesh Jain link.
Metadata, text, and multimedia. Based on research literature, trade literature, and even popular press it is very easy to get the impression that semantics will be no issue because we are now going to attach metadata to all forms of data. It appears that the current belief is that once metadata is available, semantics problems are solved. Wouldn't it be nice, if this was even close to truth? ¶ So what is metadata and how does it solve the semantics problem. ... Ramesh Jain link.