- From: Jeni Tennison <jeni@jenitennison.com>
- Date: Tue, 23 Oct 2001 10:51:25 +0100
- To: "Rajendra" <rajendrabp@samyog.com>
- CC: xmlschema-dev@w3.org
Hi Rajendra, > the above example is definition of attribute element of an element > called column.Since attribute name is required in every instance of > column element it is defined as required.I want to know is it > possible to validate this attribute value when it is assigned null > value such as this > <column name =""/> > I do not want any null values to be enrtered over there....at least > some text string should be there ...so how to do this > validation?????? You need to restrict the simple type of the name attribute so that it *must* contain a character. You can use the pattern facet to fix this, with the regular expression: .+ You probably want to choose xs:token as a base type to prevent names that just consist of white space, so need: <xs:simpleType> <xs:restriction base="xs:token"> <xs:pattern value=".+" /> </xs:restriction> </xs:simpleType> You can assign this simple type to the attribute by nesting the xs:simpleType element inside the xs:attribute element as follows: <xs:attribute name="name" use="required"> <xs:simpleType> <xs:restriction base="xs:token"> <xs:pattern value=".+" /> </xs:restriction> </xs:simpleType> </xs:attribute> *Alternatively*, you might want to choose an existing data type, for example xs:NMTOKEN or xs:Name as the type of the name attribute. These data types are specifically designed for values that are names - they don't allow whitespace within the value, for example. I hope that helps, Jeni --- Jeni Tennison http://www.jenitennison.com/
Received on Tuesday, 23 October 2001 05:52:40 UTC