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XML-RPC Data Model

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The XML-RPC specification defines six basic data types and two compound data types that represent combinations of types.

Basic data types in XML-RPC
 Type  Value  Examples
int or i4 32-bit integers between - 2,147,483,648 and 2,147,483,647. <int>27</int>
<i4>27</i4>
double 64-bit floating-point numbers <double>27.31415</double>
<double>-1.1465</double>
Boolean true (1) or false (0) <boolean>1</boolean>
<boolean>0</boolean>
string ASCII text, though many implementations support Unicode <string>Hello</string>
<string>bonkers! @</string>
dateTime.iso8601 Dates in ISO8601 format: CCYYMMDDTHH:MM:SS <dateTime.iso8601>
20021125T02:20:04
</dateTime.iso8601>
<dateTime.iso8601>
20020104T17:27:30
</dateTime.iso8601>
base64 Binary information encoded as Base 64, as defined in RFC 2045 <base64>
SGVsbG8sIFdvcmxkIQ==
</base64>

These basic types are always enclosed in value elements. Strings (and only strings) may be enclosed in a value element but omit the string element. These basic types may be combined into two more complex types, arrays and structs. Arrays represent sequential information, while structs represent name-value pairs, much like hashtables, associative arrays, or properties.

Arrays are indicated by the array element, which contains a data element holding the list of values. Like other data types, the array element must be enclosed in a value element. For example, the following array contains four strings:

<value>
   <array>
      <data>
         <value><string>This </string></value>
         <value><string>is </string></value>
         <value><string>an </string></value>
         <value><string>array.</string></value>
      </data>
   </array>
</value>

The following array contains four integers:

<value>
   <array>
      <data>
         <value><int>7</int></value>
         <value><int>1247</int></value>
         <value><int>-91</int></value>
         <value><int>42</int></value>
      </data>
   </array>
</value>

Arrays can also contain mixtures of different types, as shown here:

<value>
   <array>
      <data>
         <value><boolean>1</boolean></value>
         <value><string>Chaotic collection, eh?</string></value>
         <value><int>-91</int></value>
         <value><double>42.14159265</double></value>
   </data>
   </array>
</value>

Creating multidimensional arrays is simple - just add an array inside of an array:

<value>
   <array>
      <data>
         <value>
            <array>
               <data>
                  <value><int>10</int></value>
                  <value><int>20</int></value>
                  <value><int>30</int></value>
               </data>
            </array>
         </value>
         <value>
            <array>
               <data>
                  <value><int>15</int></value>
                  <value><int>25</int></value>
                  <value><int>35</int></value>
               </data>
            </array>
         </value>
      </data>
   </array>
</value>

A simple struct might look like:

<value>
   <struct>
      <member>
         <name>givenName</name>
         <value><string>Joseph</string></value>
      </member>
      <member>
         <name>familyName</name>
         <value><string>DiNardo</string></value>
      </member>
      <member>
         <name>age</name>
         <value><int>27</int></value>
      </member>
   </struct>
</value>

This way you can implemented almost all data types supported by any programming language.


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