158

Designing XML Based Applications

design strategies, combined with other strategies for creating factory methods or

abstract factories (strategies for creating new objects where the instantiation of

those objects is deferred to a subclass), to uniformly manipulate documents that

conform to different schemas. The business object can invoke a factory class to

create instances of different XML document editor implementations depending on

the schema of the processed document. This is an alternate approach to applying

transformations for supporting several external schemas.

Interface

XMLDocumentEditor 

+setDocument:void

+getDocument:Source

+copyDocument:void

DomainSpecificXDE 

BusinessObject 

Interface

+setDocument:void

+getDocument:Source

javax.xml.trans 

uses

encapsulates

+process:void

+copyDocument:void

form.Source 

+edit:Source

+getXXX:

        DomainSpecificObject

+setXXX:void

creates, extracts/inserts

obtains/modifies

DomainSpecificObject 

assigns/retrieves

Figure 4.10

Basic Design of an XML Document Editor