In the following sections, we describe the three goals along with some examples respectively. In the Multi-Media Broker project, a set of products or services and their relationship distributed over the web are described. One of the conceptual objects is Product . Product is something provided by a Supplier or the Boker System . Product may have a product number , a name , a pricing model , a resource creator , a creation date , and so on so forth.
Product can be Goods like books or Service like news-bulletin.
Let us suppose that all these conceptual objects are associated with some web resources. In other words, we suggest that they are stored in one or several web pages in, e.g., HTML . We use a conceptual model to describe these items and their relationships as follows. The advantages of the DC representation are that it provides a relatively complete description of attributes and it gives a readily tailored format for classification. The above is just some fragments of the description of the Product schema.