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11. The Xen API using none tointegrate none with web,windows ean 13 generation XML-RPC European Article Number 8 If you are already f amiliar with XML-RPC, you can skip this section. If not, this should serve as an overview of the protocol, rather than a complete reference. It should, however, provide enough detail to gain an understanding of the XML-RPC usage within the context of the Xen API.

. XML-RPC Data Types As with most program ming languages, XML-RPC de nes a small number of primitive data types, and then allows them to be joined together to produce compound data types. Those of relevance to the Xen API are int double, boolean, dateTime .iso8601, and string .

These are used to represent int, oat, bool, DateTime and string types in the abstract API. Each primitive type is represented by a string contained in a pair of XML tags. A oating point value, for example, might be represented in the following way:.

<double >3.14159 </ double> The data must be esc aped as valid XML character data. In practice, this limitation only applies to the string type, because none of the others permit any characters that are not valid XML. Within the context of the Xen API, all integers are assumed to be 64 bit.

From these simple data types, more complex ones can be constructed. XMLRPC permits two methods of doing this: structs and arrays. These closely mirror the C compound data types of the same name.

Arrays and structs are both quite similar both contain a list of child elements. Arrays contain an ordered list of children, whereas structs contain an unordered list of key-value pairs. Unlike C arrays, XML-RPC arrays can have heterogeneous contents.

Another key di erence from C is that the type of every value is encoded with the value, rather than by the variable containing the value. The following is a valid XMLRPC array:. <a r r a y > & none none lt;data> <v a l u e ><double >3.14159 </ double ></v a l u e > <v a l u e ><i n t >12</ i n t ></v a l u e > <v a l u e ><s t r i n g >Xen i s t h e a n s w e r . </ s t r i n g ></v a l u e > </data> </a r r a y >.

Each array tag must contain exactly one data tag, which may contain any number of values. Structs are similar. Unlike C structs, which have a rigid structure, XML-RPC structs are associative arrays.

Each struct has an arbitrary. 11.1. XML-RPC number of key-value pairs. Keys are character data strings, and values can be any XML-RPC type, including arrays or structs. The following shows a simple struct:.

<s t r u c t > none for none <member> <name>Answer </name> <v a l u e ><i n t >42</ i n t ></v a l u e > </member> <member> <name>Q u e s t i o n </name> <v a l u e ><s t r i n g >To be , o r n o t t o be </ s t r i n g ></v a l u e > </member> <member> <name>True </name> <v a l u e ><b o o l e a n >1</b o o l e a n ></v a l u e > </member> </ s t r u c t >. Remote Procedure Calls De ning an XML forma none none t for structured data is potentially useful, but it s not the core of XML-RPC. RPC stands for remote procedure call, and so there needs to be some mechanism for doing this. The standard is built on top of HTTP; each call and response is an HTTP request and response pair.

The format of the request mirrors the structure of a procedure call. Each call contains the name and arguments of the procedure. The request is sent as an HTTP POST of this form:.

< xml v e r s i o n = 1.0 > <methodCall> <methodName>e x a m p l e . f u n c t i o n </methodName> <params> <param> <v a l u e ><s t r i n g >p a r a m e t e r </ s t r i n g ></v a l u e > </param> </params> </methodCall>.

The method name is j none for none ust a string, but convention is to treat them as a dotseparated hierarchy. The response is a similar format:. < xml v e r s i o n = 1.0 > <methodResponse> <params> <param> <v a l u e ><s t r i n g >South Dakota </ s t r i n g ></v a l u e >.
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