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To illustrate the power of the XML Schema mechanism, the first three listings briefly compare the different ways of representing elements. Listing 2 shows these two elements declared in DTD syntax, and Listing 3 consists of the corresponding XML Schema syntax.Note that the syntax in Listing 3 is the same as XML syntax.Listing 3 defines the names as does not refer to any file at all, only to an assigned name.Definitions and declarations in a schema can refer to names that may belong to other namespaces. Each schema has one target namespace and possibly many source namespaces.To understand better how to specify the schema location and use the default namespace, consider the extension to the example in Listing 5..
(The examples in this article to this point have been user-defined simple types (see In an XML document, an element may embed other elements. XML Schema instead defines an element, which has a type, and that type can have declarations of other elements and attributes. XML Schema offers greater flexibility than DTD for expressing constraints on the content model of elements.by Domenico Briganti is licensed under a Creative Commons Attribuzione 3.0 Unported License.Permissions beyond the scope of this license may be available at [email protected] the simplest level, as in DTD, you can associate attributes with an element declaration and indicate that a sequence of one only (1), zero or more (*), or one or more ( ) elements from a given set of elements can occur in it.You can express additional constraints in XML Schema using, for example, Explore XML Schema further through the documentation on the W3C site (see Related topics) and by watching the d W XML zone for more coverage.
In XML Schema, the content model of an element is defined by its type.