add Schema-level customization attributes: add-prefix, add-suffix

add-prefix:
Prefix string to be added from schema names before converting to Java names. The value is a prefix string.

add-suffix:
Suffix strings to be added from schema names before converting to Java names. The value is a suffix string.

e.g.:
<xsd:complexType name="RelationType">
<xsd:sequence>
<xsd:element name="id" type="xsd:string" />
<xsd:element name="name" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>

should result in a class named RelationTypeDTO

public class RelationTypeDTO