Using XML with Legacy Business Applications

Setting a Maximum Length

It is very common to see restrictions on the length of string Elements. To avoid truncating alphanumeric values before inserting them into a database, some programmers create schemas that make sure no one can use a string long enough to be truncated. To restrict our column lengths we can create a String1024Type type derived from string, as follows.

Setting a Maximum Length in SimpleCSV2.xsd

<xs:simpleType name="String1024Type"> <xs:annotation> <xs:documentation>This user-defined type shows how we restrict our columns to 1024 characters </xs:documentation> </xs:annotation> <xs:restriction base="xs:string"> <xs:maxLength value="1024"/> </xs:restriction> </xs:simpleType>

We use the xs:simpleType Element with its name ...