Designing Your own XML Schema: Constraining with Restrictions - Restricting lengths in XML Schema (Page 4 of 6 )
Let us consider that we would like to have any employee name restricted to fifty characters, with a minimum of four characters. The following complete schema would accomplish this:
<? xml version = "1.0 " encoding = "UTF-8 "?>
< xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema " elementFormDefault = "qualified " attributeFormDefault = "unqualified ">
< xs:element name = "Employees ">
< xs:annotation >
< xs:documentation > Contains All Employee information</ xs:documentation >
</ xs:annotation >
< xs:complexType >
< xs:sequence >
< xs:element name = "Employee " maxOccurs = "unbounded ">
< xs:complexType >
< xs:sequence >
< xs:element name = "Name ">
< xs:simpleType >
< xs:restriction base = "xs:string ">
< xs:maxLength value = "50 " />
< xs:minLength value = "4 " />
</ xs:restriction >
</ xs:simpleType >
</ xs:element >
</ xs:sequence >
< xs:attribute name = "ID " type = "xs:string " use = "required " />
</ xs:complexType >
</ xs:element >
</ xs:sequence >
</ xs:complexType >
</ xs:element >
</ xs:schema >
You need to observe the following fragment within the above complete schema, which actually does the restriction:
< xs:element name = "Name ">
< xs:simpleType >
< xs:restriction base = "xs:string ">
< xs:maxLength value = "50 " />
< xs:minLength value = "4 " />
</ xs:restriction >
</ xs:simpleType >
</ xs:element >
The most important parts are the “maxLength” and “minLength” which handle our restriction.
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Designing Your own XML Schema: Restrictions and User Defined Types
