By G Antoniou; Frank Van Harmelen
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Extra resources for A semantic Web primer
The preﬁx xsd denotes the namespace of that schema (more on namespaces in the next section). 0"> In the following we omit the xsd preﬁx. Now we turn to schema elements. Their most important contents are the deﬁnitions of element and attribute types, which are deﬁned using data types. Element Types The syntax of element types is
In addition to deﬁning elements, we have to deﬁne attributes. This is done in an attribute list. The ﬁrst component is the name of the element type to which the list applies, followed by a list of triplets of attribute name, attribute type, and value type. An attribute name is a name that may be used in an XML document using a DTD. Attribute Types They are similar to predeﬁned data types, but the selection is very limited. The most important types are • CDATA, a string (sequence of characters) • ID, a name that is unique across the entire XML document • IDREF, a reference to another element with an ID attribute carrying the same value as the IDREF attribute • IDREFS, a series of IDREFs • (v1 | .
Sometimes “Web of Trust” is used to indicate that trust will be organized in the same distributed and chaotic way as the WWW itself. Being located at the top of the pyramid, trust is a high-level and crucial concept: the Web will only achieve its full potential when users have trust in its operations (security) and in the quality of information provided. 5 Book Overview 19 Book Overview In this book we concentrate on the Semantic Web technologies that have reached a reasonable degree of maturity.