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For security and comfort reasons. In the XML Security package, there exist many kinds of Resolvers for different purposes. Resolvers in this package do the same job as an EntityResolver in the SAX package: retrieve information from the apropriate location and give it to the parser/software who needs it. The reason for offering these different Resolvers is that it should be under complete control of the application which connections to the network are made. In the security area, it wouldn't be a good idea to imediately fetch some documents from the web or make other connections only because you want to verify a Signature. This resolver framework gives the application developer the ability to have total control about the interface from the library to the rest of the world.

3.2.

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ResourceResolvers

A ResourceResolver is used by a Reference to retrieve the signed resource from it's location. Different resolvers exist to get signed portions from the XML document in which the signature resides, to make HTTP connections or to fetch files from the local file system.

The concept of a ResourceResolver is very similar to an org.xml.sax.EntityResolver, but in contrast to that Interface, the ResourceResolver is able to de-reference contents inside an XML document.h7

3.3

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StorageResolver

A StorageResolver is used by KeyInfo and it's child objects / Elements to retrieve Certificates from storage locations. This approach is used to allow a user to customize the library for use in a specific corporate environment. It's possible to write StorageResolver s who make requests to LDAP servers or to use specificic PKI interfaces.
Bundled with the software come three sample StorageResolver s which can be used for common tasks:

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Generally, a StorageResolver has only a method to return an Iterator which iterates through the available Certificates.h7.

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.3. KeyResolver

A KeyResolver is used by KeyInfo to process it's child Elements. There exist two general classes of a KeyResolver :

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