XML Schema to restrict one field based on another
- by Kevin Albrecht
I have the following schema, which I use to ensure that a person's PhoneNumber and PhoneNumberType (Home, Work, etc.) is not longer than 10 characters. However, I want to improve this schema so that PhoneNumberType is not required if a PhoneNumber is not provided, but is required if the PhoneNumber is provided. Is there a way to do this in XML Schema 1.0?
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xs:element name="PhoneNumber">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:minLength value="0"/>
<xs:maxLength value="10"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="PhoneNumberType">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:minLength value="0"/>
<xs:maxLength value="10"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xsd:schema>
