Hi,
below are the sample to play with
<?xml version="1.0" encoding="utf-8"?>
<UsersList>
<User>
<Name>sam</Name>
<BirthTime></BirthTime>
</User>
<User>
<Name>wit</Name>
<BirthTime></BirthTime>
</User>
</UsersList>
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="qualified">
<xs:element name="UsersList">
<xs:complexType>
<xs:sequence>
<xs:element ref="User" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="User">
<xs:complexType>
<xs:sequence>
<xs:element ref="Name" />
<xs:element ref="BirthTime" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name = "Name">
<xs:simpleType>
<xs:restriction base = "xs:string">
<xs:pattern value="[a-zA-Z0-9]*"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="BirthTime">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="(0[0-9]|[1][0-9]|2[0-3]):[0-5][0-9]"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:schema>
Basically i want the birth time should allow empty value or value with HH:MM format. for HH:MM format i managed but unable to allow the emoty value. tried with nillable = true option. but not working. any sugestion please