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208 The XML Files: Development of XML/XSL Applications Using WebSphere Studio
9.2.7 Modify passenger list application to use the Web Service
We are going to modify our passenger List application, to use the Web Service.
The new approach includes an input form where the user can enter the flight
Number to get the passenger List. The servlet receives this information and uses
the Java proxy generated in 9.2.5 “Create the Web Service from DADX file” on
page 199. The Web services returns XML data, which is transformed using XSLT
Processor by the servlet, and returns and HTML response. See Figure 9-21 on
page 208.
Figure 9-21 Passenger List application
Mapping DTDIDs to XSD namespaces and locations
The DTDID used by DXX is typically the local file path of the DTD. DXX retrieves
the DTD either from the file system or the DTD_REF table. However, the use of a
local file path is not appropriate for Web services since the result is sent to
remote clients that do not have access to the server file system. The correct way
to specify the document structure is by giving the namespace and location of an
XML Schema (XSD) document for the result. The namespace and location are
specified using an <import> element in the WSDL document that describes the
Web Service.
DxxInvoker must, therefore, associate an XSD namespace and location with
each DTDID that is used in the DAD documents that are referenced by the
Airline
Airline
DB
DB
XSLT
HTTP
HTML
Servlet
Web
Service
XML
Data
XSLT
Processor
SOAP
Java
Proxy