![]() Note: A type can be defined as a string but not haveĪny content, this is not true for all data types. Examples of simple elements and their XML data are shown below: If we have set the type property for an element in the XSD, then the corresponding value in the XML document must be in the correct format for its given type otherwise this will cause a validation error when a validating parser attempts to parse the data from the XML document. You can also create user defined types using the and constructs, which we will cover later. Elements of these simple data types are said to have a 'simple content model', whereas elements that can contain other elements are said to have a 'complex content model' and elements that can contain both have a 'mixed content model'. There are a number of predefined simple types, such as xs:string, xs:integer, xs:boolean and xs:date (see XSD standard for a complete list). The 'type' property provides the description of what type of data can be contained within the element when it appears in the XML document. Elements are the main building block of all XML documents, containing the data and determine the structure of the instance document.Īn element can be defined within an XSD as follows:Įach element definition within the XSD must have a 'name' property, which is the tag name that will appear in the XML document.
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