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| There are two main kinds of data types: primitive data types and derived data |
| types.<br> |
| <br> |
| <b>Primitive data types</b> |
| <br> |
| Primitive data types are those that are not defined in terms of other data |
| types. |
| Since primitive data types are the basis for all other types, they cannot have |
| element content or attributes. However, they can contain values and |
| constraints. |
| Primitive data types are built into XML schemas. |
| Examples of primitive data types are string, float, decimal, anyURI, and |
| QName.<br> |
| <br> |
| <b>Built-in data types:</b> |
| <br> |
| <br> |
| <img alt="XML Schema built-in datatypes" src="images/type-hierarchy.gif"> |
| <br> |
| The above diagram is from <a href="http://www.w3.org/TR/xmlschema-2/#built-in-datatypes"> |
| XML Schema Part 2: Datatypes specification</a>.<br> |
| <br> |
| |
| Getting access to the primitive data types (in other words, xsd:string) in the schema for |
| schemas using the XML Schema |
| model is done by calling the following method where rootSchema is the root |
| schema that was |
| created in <a href="os-schema2-2-2.html">Exercise 1: Create a root schema document</a>. |
| </p><pre><font size="2" face="Courier New"> |
| XSDSchemaImpl.getSchemaForSchema(rootSchema.getSchemaForSchemaNamespace()). |
| resolveSimpleTypeDefinition(XSDConstants.SCHEMA_FOR_SCHEMA_URI_2001,"string"); |
| </font></pre><p> |
| <b>Derived data types</b> |
| <br> |
| Derived data types are those that are defined in terms of other data |
| types, which are called base types. Derived types may have attributes, and may |
| have element or mixed content. Instances of derived types can contain |
| any well-formed XML that is valid according to their data type definition. |
| They may be built-in or user-derived. Base types can be primitive types or |
| derived data types. Derived data types are created using extension and |
| restriction |
| facets. They can be built-in or user-derived data types.<br> |
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