Download A Developers Guide to the Semantic Web by Liyang Yu PDF

By Liyang Yu

The Semantic internet represents a imaginative and prescient for the way to make the massive quantity of data on the internet instantly processable through machines on a wide scale. For this objective, an entire suite of criteria, applied sciences and comparable instruments were exact and built during the last couple of years, they usually have now turn into the basis for various new applications.

A Developer’s advisor to the Semantic Web is helping the reader to profit the middle criteria, key elements, and underlying options. It presents in-depth insurance of either the what-is and how-to elements of the Semantic internet. From Yu’s presentation, the reader will receive not just a pretty good knowing concerning the Semantic net, but additionally how one can mix everything to construct new purposes at the Semantic Web.

Software builders in and scholars focusing on net improvement or Semantic internet applied sciences will locate during this booklet the main entire advisor to this interesting box to be had this day. in line with the step by step presentation of real-world tasks, the place the applied sciences and criteria are utilized, they are going to gather the data had to layout and enforce state of the art applications.

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Additional info for A Developers Guide to the Semantic Web

Example text

This does open up another whole set of questions. For example, is it good to always reuse URIs, or should we sometimes invent our own? If reuse is desirable, then for a given resource, how do we know if there exists some URI already? How do we find it? What if there are multiple URIs existing for this single resource? At this point, we are not going into the details of the answers to these questions, since they are all covered in later chapters. For now, one thing important to remember is to always reuse URIs and only invent your own if you absolutely have to.

The name of predicate must also be global and should be identified by URI as well. 32 2 The Building Block for the Semantic Web: RDF Using URIs to identify predicates is important for a number of reasons. The first reason is similar to the reason why we should use URIs to name subjects and objects. For example, one group of reviewers who reviews cameras may use string model to indicate the fact that Nikon D300 has D300 as its model number, and another group of reviewers who mainly review television sets could also have used model to mean the specific model number of a given TV set.

Org/resource/Nikon In fact, we did not coin this URI, and it is an existing one. So why should we use an existing URI to represent Nikon? The reason is very simple: if a given resource has a URI that identifies it already, we should reuse this existing URI whenever we can. In our case, we happen to know the fact that the above URI created by DBpedia project4 (DBpedia is a well-known application in the world of the Semantic Web; you will see more details about it in Chap. 10) does represent Nikon, and it is indeed the same Nikon we are talking about.

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