Using Java to Handle Custom WSDL Data Types : Page 2

WSDL and the XML Schema Specification
Even though you can use any encoding format for WSDL type definitions, the WSDL specification suggests using XML Schema Definitions (XSD). XSD or XML Schema is a W3C standard that seeks to supersede the document type definition (DTD) standard for defining structure within an XML document. XML Schema defines a comprehensive set of programming-language independent, primitive/simple data types, such as doubles, strings, and integers, as well as a mechanism for creating complex types using the predefined simple types (see Table 1). Table 1. XML Schema Simple Types: The table shows a list of the simple types predefined in XSD.

Simple Type	Examples
string	This is a string
normalizedString	This is a normalized string
token	This is a token
base64Binary	GpM7
hexBinary	0FB7
integer	-1, 0, 103
positiveInteger	1, 2, 215
negativeInteger	-563, -2, -1
nonNegativeInteger	0, 1, 2, 672
nonPositiveInteger	37 -2, -1, 0
long	-9223372036854775808, ... -1, 0, 1, ... 9223372036854775807
unsignedLong	0, 1, ... 18446744073709551615
int	-2147483648, ... -1, 0, 1, ... 2147483647
unsignedInt	0, 1, ...4294967295
short	-32768, ... -1, 0, 1, ... 32767
unsignedShort	0, 1, ... 65535
byte	-128, ...-1, 0, 1, ... 127
unsignedByte	0, 1, ... 255
decimal	-1.23, 0, 123.4, 1000.00
float	-INF, -1E4, -0, 0, 12.78E-2, 12, INF, NaN
double	-INF, -1E4, -0, 0, 12.78E-2, 12, INF, NaN
boolean	true, false, 1, 0
duration	P1Y2M3DT10H30M12.3S
dateTime	1999-05-31T13:20:00.000-05:00
date	1999-05-31
time	13:20:00.000, 13:20:00.000-05:00
gYear	1999
gYearMonth	1999-02
gMonth	—05
gMonthDay	—05-31
gDay	—-31
Name	shipTo
QName	po:USAddress
NCName	USAddress
anyURI	http://www.example.com/,http://www.example.com/doc.html#ID5
language	en-GB, en-US, fr

The WSDL <types> element defines data types that are to be exchanged between service consumers and providers. If the service defined by the WSDL document uses only the built-in XML Schema simple types, you don't have to include a <types> element; instead, you can use the element to define your own types. Listing 1 shows a simple WSDL document that includes a <types> element:

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