190
Performance Considerations
Internet
Intranet
Entity 
Resolution
 Schema 
 Cache
Repository
Entity 
Resolution
Web Service 
Order 
Web Service 
Front End
Processing 
Nonvalidated 
Client
Valid 
Center
XML
XML
Legend
Validate always plus caching in memory
Validate optionally plus caching in memory
Figure 4.15
An Architecture for Caching External Entities
There are two complementary ways to reduce the cost of referencing external
entities: 
1.
Caching using a proxy cache
 You can improve the efficiency of locating 
references to external entities that are on a remote repository by setting up a 
proxy that caches retrieved, external entities. However, references to external 
entities must be URLs whose protocols the proxy can handle. (See Figure 4.15, 
which should be viewed in the context of Figure 4.14.)
2.
Caching using a custom entity resolver
 SAX parsers allow XML applica 
tions to handle external entities in a customized way. Such applications have
to register their own implementation of the 
org.xml.sax.EntityResolver
 in 
terface with the parser using the 
setEntityResolver
 method. The applications
are then able to intercept external entities (including schemas) before they are
parsed. Similarly, JAXP defines the 
javax.xml.transform.URIResolver
 inter 






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