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Uche Ogbuji wrote: >>There's also the question of context -- would the only context be the >>stack, or do people hope to have access to left siblings as well? > > > I'd say only the parent stack, or shallow but very wide documents become > resource hogs. An extension mechanism could allow implementations to > support sibling access, or perhaps that would be a matter of conformance > levels (a la DOM or XAPI). Why not leave this to the application to decide. Just provide a hook for accessing context, but don't make a decision what to provide. Providing these hooks just on the parent stack should be sufficient, because at the parent level one can aggregate context as needed. I have found that even transformations that require some backward navigation can be done using a streaming approach. Even for a document where the first line of output needs to process the last line of input you often do not need to build a complete DOM. Karl
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