.xsd xs:int overloading

[simonchristieis]

I am looking to overload a simple type that has an xs:int restriction, I want the next restriction to be xs:int or empty. I know I can use the same process for an xs:string.

<snipped>

<xs:simpleType name="VerifyDateType">
	<xs:restriction base="VerifyDateType"/>
</xs:simpleType>

<xs:simpleType name="VerifyDateType">
	<xs:restriction base="xs:int"/>
</xs:simpleType>

</snipped>

I am looking for something like:

<xs:simpleType name="VerifyDateType">
	<xs:restriction base="VerifyDateType">
                <xs:minLength value="0"/>
        </xs:restriction>
</xs:simpleType>

Thanks in advance

Simon

 

[tsuji]

The problem may be already at the prelude leading to the problem itself. I am not sure if we can give a simplyType of name which itself is the base of the simpleType in question to impose further restriction.
<xs:simpleType name=[tt][red]"VerifyDateType"[/red][/tt]>
<xs:restriction base=[tt][red]"VerifyDateType"[/red][/tt]/>
</xs:simpleType>
Is it kind of typo? or is it the real intention to convey?

 

[simonchristieis]

Thanks tsuji,

The only way round the problem was to define the int as an int or string, and allow the string to have zero length. This was done using a custom type with an enumeration equalling "".

Custom Types:

<xs:simpleType name="int-or-empty">
	<xs:union memberTypes="xs:int empty-string"/>
</xs:simpleType>
<xs:simpleType name="empty-string">
	<xs:restriction base="xs:string">
		<xs:enumeration value=""/>
	</xs:restriction>
</xs:simpleType>

Base Type (BaseType.xsd):

<xs:simpleType name="VerifyDateType">
	<xs:restriction base="int-or-empty"/>
</xs:simpleType>

Redefined Overload:

<xs:redefine schemaLocation="BaseType.xsd">
	<xs:simpleType name="VerifyDateType">
		<xs:restriction base="VerifyDateType">
			<xs:pattern value="[0-9]{8}"/>
		</xs:restriction>
	</xs:simpleType>
</xs:redefine>