As part of the SOAP specifications it does not include specific definitions for data types, but it includes some built-in rules for encoding data types based on XML Schema specifications. For more details you can access: http://www.w3.org/2001/12/soap-encoding

Primitive Data types

The XML Schema specification has a list of already supported datatypes that are included in SOAP, you can find more information here: http://www.w3.org/TR/2000/WD-xmlschema-2-20000407/

The following are some of the primitive data types already supported by SOAP:

string: represents character strings in XML.

boolean: used for representing the mathematical concept of binary-valued logic: true or false

float: used for representing the IEEE single-precision 32-bit floating point type

double: used for representing the IEEE double-precision 64-bit floating point type

decimal: used for representing arbitrary precision decimal numbers

binary: used for representing arbitrary precision binary data

Derived Data Types

The following are some of the derived data types already supported by SOAP:

integer: this data type is derived from decimal

long: this data type is derived from integer.

int: this data type is derived from long.

short: this data type is derived from int.

byte: this data type is derived from short.

time: used for representing an instant of time that recurs every day

date: used for representing a period of time starting at midnight of an specific day and lasts for 24 hours

Compound Types

The XML Schema definition describes that new compound types should be defined by using a complexType element and it usually includes a set of element declarations, perhaps element references and attributes declarations.

The following is a compound definition for a complex type:

<xsd:complexType name = "Address" >
    <xsd:element name = "street" type = "xsd:string" />
    <xsd:element name = "number" type = "xsd:integer" />
</xsd:complexType>