Unique costraint in XML Schema

[hyppos]

Hi,
I've a XML Schema with this user Type

<xsd:simpleType name="ResultArrayType">
<xsd:restriction base="xsd:nonNegativeInteger">
<xsd:maxExclusive value="1000"/>
</xsd:restriction>
</xsd:simpleType>

How can I add an unique costraint to this type?

 

[Martin Honnen]

hyppos wrote:

I've a XML Schema with this user Type

<xsd:simpleType name="ResultArrayType">
<xsd:restriction base="xsd:nonNegativeInteger">
<xsd:maxExclusive value="1000"/>
</xsd:restriction>
</xsd:simpleType>

How can I add an unique costraint to this type?

You can use <xsd:unique> at the place where you use this type for an element definition I think.

 

[hyppos]

You can use <xsd:unique> at the place where you use this type for an element definition I think.

--

Could you give me an example?

 

[hyppos]

You can use <xsd:unique> at the place where you use this type for an element definition I think.

Like This?

<xsd:simpleType name="ResultArrayType">
<xsd:restriction base="xsd:unique">
<xsd:maxExclusive value="1000"/>
</xsd:restriction>
</xsd:simpleType>

unfortunately, doesn't work.

 

[Priscilla Walmsley]

Hi,

You specify the uniqueness constraint on the element, not the type. For example, if you had an element named "Number" with that type, and you wanted its value to be unique within the scope of its parent element "listOfNumbers", it would look something like this:

<xs:element name="listOfNumbers">
<xs:complexType>
<xs:sequence>
<xs:element name="Number" type="ResultArrayType"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:unique name="uniqueNum">
<xs:selector xpath="Number"/>
<xs:field xpath="."/>
</xs:unique>
</xs:element>

Hope that helps,
Priscilla

 

[Martin Honnen]

Like This?

<xsd:simpleType name="ResultArrayType">
<xsd:restriction base="xsd:unique">
<xsd:maxExclusive value="1000"/>
</xsd:restriction>
</xsd:simpleType>

unfortunately, doesn't work.

No, a type can't be unique, only an element or attribute in a certain scope, see the example in http://www.w3.org/TR/xmlschema-0/#specifyingUniqueness

 

[Henry S. Thompson]

No, a type can't be unique, only an element or attribute in a certain scope, see the example in http://www.w3.org/TR/xmlschema-0/#specifyingUniqueness

The advice is good, but there are a few glitches in the original version of the Primer -- a better reference is the draft 2nd edition at

http://www.w3.org/TR/2004/PER-xmlschema-0-20040318/#specifyingUniqueness

ht

 

[hyppos]

Thks to Everybody