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| Attribute declarations | page 4 of 6 |
Complex Type definitions contain attributes, which are used by complex
elements.
Attributes themselves are always declared with a simple type.
This means that an element with attributes always has a complex
structure.
Attribute declarations can be global, local, or references, and are used
for:
- Local validation of attribute information item
values using a simple type definition
- Specifying default or fixed values for attribute
information items
The <attribute> element contains attributes, which are described
by
XML Schema Part 1: Structures of the standard.
The XML Schema model java interface for a <attribute> is
org.eclipse.xsd.XSDAttributeDeclaration and
can be created by calling
org.eclipse.xsd.XSDFactory.eINSTANCE.createXSDAttributeDeclaration().
Attribute use
Local attribute declarations and attribute references can be optional,
required, or prohibited
by changing the attribute use usage attribute.
If an attribute is local or a reference, it can contain attributes,
which
are described by
http://www.w3.org/TR/xmlschema-1/#cAttributeUse.
Referencing a global attribute ceclaration
If you declare a global attribute declaration, you can reference this
attribute in the remainder of the schema
using the ref attribute. This is done by calling the following method
on the
XML Schema model:
org.eclipse.xsd.XSDAttributeDeclaration.setResolvedAttributeDeclaration(XSDAttributeDeclaration).
Any attribute
The <anyAttribute> element enables us to extend the XML instance
document
with attributes not specified by the schema.
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