Inside Dynamics AX 4.0: AIF Architectural Overview

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The overall AIF architecture, shown in below image, consists of two major components: transport and business logic exposure. This chapter focuses primarily on business logic exposure, which is what you will modify as you implement new documents or modify default solutions.

The AIF architecture, showing business logic below and transport layers above.

The design of the Dynamics AX business logic encompasses two primary type hierarchies: AxInternalBase and AxdBase. You can think of the AxInternalBase class hierarchy as an extension of the table functionality. Your custom classes inherit the table properties and settings, and you must subsequently apply any additional business logic and validation to suit your needs. The children classes of AxInternalBase in Dynamics AX 4.0 primarily implement validation, value substitution, and value defaulting.
New XML documents inherit the AxdBase class. This class allows you to serialize and deserialize XML from and to Dynamics AX; it is also the single point of entry to Dynamics AX whether you want to query, read, or create documents. The AxdBase class implements the AifServiceable interface, which enables the derived classes to be externally available through either Web services or the transport layers in the AIF. In below image illustrates the interaction between the Dynamics AX core business functionality and the XML application programming interface (API), as well as the interaction between the XML API and the transport layers of the AIF.

The interaction between the document classes and their surroundings.

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Источник: http://feeds.feedburner.com/~r/Insid...-overview.html