Re: Entity resolution vs. URI resolution
/ Elliotte Rusty Harold <elharo@m...> was heard to say: | At 1:58 PM -0500 1/24/02, Norman Walsh wrote: | |>| offers exactly the functionality you're looking for: |>| |>| public URL(URL context, |>| String spec) |>| throws MalformedURLException [...] | The following methods are particularly interesting: | | public URI resolve(URI uri) | public URI resolve(String uri) | | These return the absolute form of the uri argument using the current | URI object as the context. Isn't this what you want? Not at all. Given a possibly null public identifier and a system identifier, the resolveEntity() method is free to perform any sort of calculation that it wants. In particular, it is free to examine some other resource (such as an external catalog, local cache, or the phase of the moon) and return the InputStream for the entity. With this facility, I can arrange things so that when I parse documents that contain the system identifier http://example.com/some.dtd, the actual DTD used is file:/share/dtds/example.com/some.dtd. This is very convenient when I don't happen to be on the net. I want precisely the same facility for URIs that are retrieved in contexts other than external identifiers. If someone asks for the schema module http://example.com/module.xsd, or the XInclude document ftp://example.com/sometext.xml, or the stylesheet module urn:x-foo:example:stylesheet:module, I want the ability to determine (with reference to any other resources I choose, though practically an XML Catalog), what resource to actually return for the URI in question. And I don't want to shoehorn this into resolveEntity(null, myURI) because that makes all URIs appear to be external identifiers, which they aren't. Be seeing you, norm -- Norman.Walsh@S... | A philosophical contempt of life is no XML Standards Engineer | guarantee of courage in the face of XML Technology Center | death.--Gustave Vapereau Sun Microsystems, Inc. |
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