XSD Tutorials - Herong's Tutorial Examples - v5.23, by Herong Yang
Specifying Element Datatype - "type" Attribute
This section describes a tutorial example on how to specify a datatype in an Element Declaration Component.
An element declared with no specific datatype is too generic to be useful, because it can have any attributes, sub (child) elements, and body contents. To declare an element with a specific datatype, you have 3 options:
Example 1, word_builtin_datatype.xsd - Specifying the built-in datatype "string" to the root element "word".
<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- word_builtin_datatype.xsd - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved. --> <!-- Using XML Schema built-in datatype "string" --> <xs:element name="word" type="xs:string"/> </xs:schema>
Example 2, word_anonymous_datatype.xsd - Specifying an anonymous (inline) datatype based on the built-in "string" to the root element "word".
<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- word_anonymous_datatype.xsd - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved. --> <!-- Using an anonymous datatype --> <xs:element name="word"> <!-- Defining the anonymous datatype based "string" --> <xs:simpleType> <xs:restriction base="xs:string"> <xs:maxLength value="40"/> </xs:restriction> </xs:simpleType> </xs:element> </xs:schema>
Example 3, word_named_datatype.xsd - Specifying a named datatype, "myString" based on the built-in "string" to the root element "word".
<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <!-- word_named_datatype.xsd - Copyright (c) 2002-2013 HerongYang.com. All Rights Reserved. --> <!-- Using a named datatype "myString" --> <xs:element name="word" type="myString"/> <!-- Defining the named datatype based on "string" --> <xs:simpleType name="myString"> <xs:restriction base="xs:string"> <xs:maxLength value="40"/> </xs:restriction> </xs:simpleType> </xs:schema>
In all 3 examples above, the "word" element is declared to have a specific datatype, which dictates that the "word" must have a string as its content with no attribute and no sub (child) elements.
Table of Contents
XML Editor and Schema Processor - XMLPad
Java API for XML Processing - JAXP
JAXP - XML Schema (XSD) Validation
Xerces2 Java Parser - Java API of XML Parsers
Schema and Schema XML Representation
Checking Schema Documents - XsdSchemaChecker.java
Creating Schema Documents - "schema" Element
Declaring Root Elements - "element" Element
►Specifying Element Datatype - "type" Attribute
Using XML Schema Built-in Datatypes
Using XML Schema Built-in Datatypes Incorrectly
Validating XML Documents against Schema Documents
Deriving New Simple Datatypes - "simpleType" Element
Defining Complex Datatypes - "complexType" Element
Validation Error Examples on Complex Datatypes
Introduction of XSD Built-in Datatypes
"string" and Its Derived Datatypes
"decimal" and Its Derived Datatypes
"dateTime" and Its Related Datatypes
Miscellaneous Built-in Datatypes
Facets, Constraining Facets and Restriction Datatypes
"simpleType" - Defining Your Own Simple Datatypes
Identity-Constraints: unique, key and keyref
Assertion as Custom Validation Rules
XML Schema Location and Namespace in XML Documents
Overriding Element Types in XML Documents