11.2. An Example of a Complex Type That Adds Attributes to a Simple Type
A complex type can add attribute types to a simple type. Listing 11.2 is the complex type salePriceType. salePriceType extends the globally described dollarPriceType simple type by adding the saleAttributeGroup attribute group. Note that the simpleContent element provides the functionality to extend simple types into complex types.
Listing 11.2. Adding an Attribute to a Simple Type (pricing.xsd)
<xsd:complexType name="salePriceType"
block="#all"
final="extension"
id="salePriceType.pricing.cType">
<xsd:annotation>
<xsd:documentation xml:lang="en">
Anything on sale must have a price
and an authorization.
</xsd:documentation>
</xsd:annotation>
<xsd:simpleContent>
<xsd:extension base="dollarPriceType">
<xsd:attributeGroup ref="saleAttributeGroup"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
<xsd:attribute name="currency"
type="xsd:token"
fixed="U S Dollars">
<xsd:annotation>
<xsd:documentation xml:lang="en">
U S Dollars are the only currency
currently allowed. This attribute
is a great example of using "ref"
(elsewhere), but is not set up well
for extending to other currencies
later. This should really be a
type that keeps getting restricted.
</xsd:documentation>
</xsd:annotation>
</xsd:attribute>
<xsd:simpleType name="currencyAmountType"
id="pricing.currencyAmount.sType">
<xsd:annotation>
<xsd:documentation xml:lang="en">
Limit all transactions to less than
500,000.00 of any currency
This can be represented as NNNNNN.NN
or eight total digits, two of which are
after the decimal point.
*********************************************
Note that the W3C XML Schema
Recommendation does not support
non-instantiable simple types.
This simple type is conceptually
not instantiable. This type is not
intended to be used directly, only
indirectly, such as via the ...DollarType
simple types.
*********************************************
</xsd:documentation>
</xsd:annotation>
<xsd:restriction base="xsd:decimal">
<xsd:totalDigits value="8" fixed="true"/>
<xsd:fractionDigits value="2" fixed="true"/>
<xsd:minExclusive value="0.00" fixed="true"/>
<xsd:maxInclusive value="500000.00" fixed="true"/>
</xsd:restriction>
</xsd:simpleType>
<xsd:simpleType name="restrictedDollarAmountType"
id="pricing.restrictedDollarAmount.sType">
<xsd:annotation>
<xsd:documentation xml:lang="en">
Nothing sells for less than $1 or
greater than or equal to $10,000.00.
</xsd:documentation>
</xsd:annotation>
<xsd:restriction base="currencyAmountType">
<xsd:minInclusive value="1.00"
fixed="true"/>
<xsd:maxExclusive value="10000.00"
fixed="true"/>
</xsd:restriction>
</xsd:simpleType>
<xsd:complexType name="dollarPriceType"
final="restriction"
block="restriction"
abstract="true"
id="dollarPriceType.pricing.cType">
<xsd:annotation>
<xsd:documentation xml:lang="en">
Currently, currency is limited to
U S Dollars. Note that this type is
non-instantiable. A derived type must be
defined that sets the range.
</xsd:documentation>
</xsd:annotation>
<xsd:simpleContent>
<xsd:extension base="restrictedDollarAmountType">
<xsd:attribute ref="currency"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:simpleType> |
The XML representation of an element type whose structure type is salePriceType might look like the following element:
<xsd:element name="salePrice" type="salePriceType"/>
Given the preceding element type, the following element is valid in an XML instance:
<salePrice>123.45</salePrice>
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