By G Antoniou; Frank Van Harmelen

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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 and they may have a number of optional attributes, such as types, type=". , *, and +, offered by DTDs. When cardinality constraints are not provided explicitly, minOccurs and maxOccurs have value 1 by default.

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.

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