90
Designing a Service's Interaction Layer
E
Before delegating these incoming client requests to the Web service business 
logic, you should perform any required security validation, transformation of 
parameters, and other required preprocessing of parameters. 
As noted in  Parameter Types for Web Service Operations  on page 72 and
elsewhere, Web service calls are basically method calls whose parameters are
passed as either Java objects, XML documents (
javax.xml.transform.Source
objects), or even SOAP document fragments (
javax.xml.soap.SOAPElement
objects).
E
For parameters that are passed as Java objects (such as 
String,
int
, JAX RPC 
value types, and so forth), do the application specific parameter validation and 
map the incoming objects to domain specific objects in the interaction layer 
before delegating the request to the processing layer.
You may have to undertake additional steps to handle XML documents that
are passed as parameters. These steps, which are best performed in the interaction
layer of your service, are as follows:
1. The service endpoint should validate the incoming XML document against its 
schema. For details and guidelines on how and when to validate incoming 
XML documents, along with recommended validation techniques, refer to 
 Validating XML Documents  on page 139.
2. When the service's processing layer and business logic are designed to deal
with XML documents, you should transform the XML document to an inter 
nally supported schema, if the schema for the XML document differs from the
internal schema, before passing the document to the processing layer. 
3. When the processing layer deals with objects but the service interface receives 
XML documents, then, as part of the interaction layer, map the incoming XML 
documents to domain objects before delegating the request to the processing 
layer. For details and guidelines on mapping techniques for incoming XML 
documents, refer to  Mapping Schemas to the Application Data Model  on 
page 143.
E
It is important that these three steps validation of incoming parameters or 
XML documents, translation of XML documents to internal supported sche 
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