SAX: ModSAX addition, general property query

John Wilson tug at
Tue Mar 9 16:06:34 GMT 1999

----- Original Message ----- 
From: Glenn Vanderburg <glv at>
To: Bill la Forge <b.laforge at>
Cc: John Wilson <tug at>; XML Developers' List <xml-dev at>
Sent: 09 March 1999 15:40
Subject: Re: SAX: ModSAX addition, general property query

>Bill la Forge wrote:
>> From: John Wilson <tug at>
>> >I don't think that it's unreasonable to insist that objects 
>> >representing a Feature, Handler or Property should either implement 
>> >a distinct interface or subclass a distinct class. If this is so 
>> >the Parser can tell what Feature, Handler or Property is being set 
>> >by enquiring of the type of the object.
>> Filters often implement more than one (generally all) handler 
>> interface and then register themselves with the underlying 
>> parser/filter for the same events requested by the overlaying 
>> application/filter.
>Yes, and as written, John's proposal would require distinct handler
>objects for each feature, which would be bad.  However, with a slight 
>modification, it would work beautifully.  Instead of using a string 
>as a feature ID, use a type descriptor (in Java, an instance of 
>java.lang.Class).  Feature handlers would be registered by supplying 
>the Class object that represents the feature being implemented, along 
>with a handler object that is assignable to that type.

This seems to me to be an excellent suggestion;)

John Wilson
The Wilson Partnership
5 Market Hill, Whitchurch, Aylesbury, Bucks HP22 4JB, UK
+44 1296 641072, +44 976 611010(mobile), +44 1296 641874(fax)
Mailto: tug at

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