SAX: ModSAX addition, general property query

John Wilson tug at
Tue Mar 9 18:41:04 GMT 1999

----- Original Message -----
From: David Megginson <david at>
To: John Wilson <tug at>
Cc: XML Developers' List <xml-dev at>
Sent: 09 March 1999 17:19
Subject: Re: SAX: ModSAX addition, general property query

>John Wilson writes:
> > I don't think that it's unreasonable to insist that objects representing
> > Feature, Handler or Property should either implement a distinct
interface or
> > subclass a distinct class. If this is so the Parser can tell what
> > Handler or Property is being set by enquiring of the type of the object.
> > favour insisting that they subclass distinct classes because (in Java)
> > naturally imposes the restriction that a single object can only
represent a
> > single Property.)
>We wouldn't want to have to rely on discovering the class at runtime,
>so we'd have to have a method in the interface that reports a string
>ID anyway -- at lot more work for the same result.

Testing the type at run time is a tivial operation in Java so I'm not sure
why you say that we wouldn't want to rely on descovering the class at run
time. If there was some worry about the performance hit on iterating through
all the supported interfaces (which I strongly doubt) the interface would
have a method that reported a Class rather than a String.

However, Glen Vanderburg has suggested an amendment to my idea which seems
to me to address you concerns.

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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