String limits

XML places no fundamental limit on the sizes of things. In particular it 
is legal and well-formed to have multigabayte:

1. Element names
2. Attribute values
3. Processing instruction data

In practice, processing instruction data is where I expect problems to 
arise first, though attribute values are also possible. SAX uses pure 
strings for all these constructs and a few others, and Java strings are 
limited to a maximum of 2.1 gigachars.

SAX currently says nothing about what to do when these boundaries are 
exceeded. This needs to be rectified. Options I see are

1. Truncation
2. Throw a SAXException
3. Throw a different exception.

I suggest 2, throw a SAXException. We wil simply say SAX cannot handle 
such extreme documents. If this becomes a more practical limit, then we 
can revisit possible solutions in the future.

--
Elliotte Rusty Harold



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