Schema Complex Empty

XML Schema Complex Empty Elements

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XML Schema Tutorial

XML Schema Tutorial XML Schemas Introduction Why Use XML Schema? How to Use XML Schema XML Schema Elements XSD Simple Elements XML Schema Attributes XML Schema Facets XML Schema Complex Elements XML Schema Complex Empty Elements XML Schema Complex Types - Only Contain Elements XML Schema Complex Elements - Only Contain Text XML Schema Complex Types - Mixed Content XML Schema Indicators XML Schema any Element XML Schema anyAttribute Element XML Schema Element Substitution XML Schema Example XML Schema String Data Types XML Schema Date/Time Data Types XML Schema Numeric Data Types XML Schema Miscellaneous Data Types XML Editor XML Schema Summary XML Schema Reference Manual XML Schema Complex Elements XML Schema Complex Types - Only Contain Elements

XSD Empty Elements

Empty complex elements cannot contain content, they can only contain attributes.

Complex Empty Element:

An empty XML element:

<product prodid="1345" />

Above, the "product" element has no content at all. To define a type with no content, we must declare a type that can only contain elements in its content, but actually we do not declare any elements, like this:

<xs:element name="product">
    <xs:complexType>
    <xs:complexContent>
    <xs:restriction base="xs:integer">
    <xs:attribute name="prodid" type="xs:positiveInteger"/>
    </xs:restriction>
    </xs:complexContent>
    </xs:complexType>
    </xs:element>

In the example above, we defined a complex type with complex content. The complexContent element signals that we intend to restrict or extend some complex type's content model, and the integer restriction declares an attribute but does not introduce any element content.

However, the "product" element can be declared more compactly like this:

<xs:element name="product">
    <xs:complexType>
    <xs:attribute name="prodid" type="xs:positiveInteger"/>
    </xs:complexType>
    </xs:element>

Or you can give a name to a complexType element, then set a type attribute for the "product" element and reference this complexType name (by using this method, several elements can refer to the same complex type):

<xs:element name="product" type="prodtype"/>
    <xs:complexType name="prodtype">
    <xs:attribute name="prodid" type="xs:positiveInteger"/>
    </xs:complexType>

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