Re: error trapping
interesting account re MESA. well, resumption does require that the module which raises the exception provide meaningfull and correctly operating provisions for restarts/continuations, and that it provide exceptions which carry information adequate to decide upon and undertake appropriate corrective action. the necessary interfaces are on the same level as the principal functional interface and, as such, would not appear to do anything to compromise encapsulation. they may be harder to correctly program than simply exiting, but that's another story. as mr. bray notes, they may not be desirable, but that's also another story. John Cowan wrote: > > james anderson scripsit: > > > one intrinsic problem with java parsers is that the java control model forces > > exceptions to unwind from the initiator's dynamic context before the handler > > obtains control. > >... > > The essential problem with resumption, IMHO, is that it breaks > encapsulation: the resumptive handler is written by the author of the > calling routine, but runs as a friend of the called routine. > To work correctly, then, the caller must know everything about the > callee. not necessarily: yes, the caller must understand the causes and consequences of the conditions raised, but they must also know and abide by the interface provided by the exceptions and are constrained to the defined restarts/continuations, both of which are specified by the callee. while this form of encapsulation may have more facets, where's it broken? xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To unsubscribe, mailto:majordomo@i... the following message; unsubscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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