SAX 2.0 extension proposals.
Toby.Speight at streapadair.freeserve.co.uk
Wed Feb 2 13:30:05 GMT 2000
Miles> Miles Sabin <URL:mailto:msabin at cromwellmedia.co.uk>
David> David Megginson <URL:mailto:david at megginson.com>
0> In article
0> <AA4C152BA2F9D211B9DD0008C79F760A675291 at odin.cromwellmedia.co.uk>,
0> Miles wrote:
Miles> * A means of querying an XMLReader implementations features
Miles> without first having to instantiate an XMLReader.
0> In article <m33drdj10x.fsf at localhost.localdomain>, ...
[David, your mail system and/or host config is broken. Try setting
the `system-name' variable in your Emacs. Also search the ding-list
archives for the string "localhost.localdomain" - somewhere there's a
patch that might help.]
0> In article <m33drdj10x.fsf at localhost.localdomain>, David wrote:
David> That's not too hard: it would take only a few static methods.
Without resorting to Reflection, it's not that easy. Invoking a
static method requires either an instance, or compile-time knowledge
of the class name. I haven't thought about the issues in a non-Java
David> There are a couple of issues, though:
David> 1. For a filter (which may be more common than a root reader),
David> the features available depend on the features supported by
David> the parent -- in other words, you cannot know what features
David> are supported *until* the reader is instantiated.
It would be nice if Miles gave some thought to this issue. Perhaps
it's an insoluble problem; perhaps filters need some additional
feature types (or additional queries on those features) to indicate
how the the upstream parser's behaviour is modified. The obvious
1. "passthrough" - the filter provides whatever the upstream parser
2. "override" - *EITHER* the filter supports the feature, even if the
upstream parser doesn't *OR* the filter doesn't support the feature,
regardless of the upstream support for it.
3. "other" - the feature's support depends on more than only the
upstream parser's support for it; perhaps it depends also on
another feature of the upstream parser.
David> 2. ...
Miles> * A plug'n'play XMLReader factory which supports multiple
Miles> parsers and transparent adaptation of SAX 1 parsers.
David> Does this belong in the SAX core, or should it be a
David> higher-level app?
I second the support in this thread for maintaining SAX in two parts,
as a core and a(n| set of) extension package(s), if possible. It
would be nice to save developers re-inventing the same wheels, and
the "SAX blessing" would help keep effort focused in one place, but
there's no need to impose the extra weight on those to whom leanness
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