Assuming a large input, your approach looks more efficient to
me as it avoids grouping where indexing into the list does the job.
Now I guess from previous answers on this list given to
similar questions that this is all implementation-defined.
In spite of this, I'm asking whether that is all that can be
said here or whether there is a rationale here to favor
indexing over grouping when (a) processing time or (b) memory
consumption are important?
In Saxon (a) grouping will actually build a hash table in memory, so it uses
more memory, and (b) indexing in the form $seq[integer] is a constant-time
operation, so the indexing approach should definitely be better.
Michael Kay
http://www.saxonica.com/
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