- From: C. M. Sperberg-McQueen <cmsmcq@blackmesatech.com>
- Date: Tue, 24 May 2022 08:36:46 -0600
- To: Norm Tovey-Walsh <norm@saxonica.com>
- Cc: Steven Pemberton <steven.pemberton@cwi.nl>, public-ixml@w3.org

Norm Tovey-Walsh writes: >> By the way, note that the following is now legal ixml: >> >> values: value+++",". > What does that mean? For what it's worth, I take it to mean <repeat1> <nonterminal name="value"/> <sep> <insertion string=","/> </ </ > ... I’m at a loss to interpret > > values: value+++",". > > If the comma is an insertion, then what is the separator? If the comma > isn’t an insertion, why is the extra “+” allowed? If it's not an insertion, I am very confused. If it is, then there is no separator, and the grammar of which this fragment is part will work best for values with fixed length or values which somehow can be parsed without delimiters. If every value must begin with a letter and end with a digit, then a1bc23def456 can be uniquely parsed without delimiters, right? For things like integers or decimal numbers, this grammar would make sense perhaps in a stress test checking how well the processor deals with finite, but fast-growing, ambiguity. Given value = ['0'-'9']+. and the input '12345', I'll get one parse with five values, one parse with one value, four each with two or four values, and seven with three values. So seventeen overall. (Hmm. This is not Pascal's Triangle. But I'm sure there is a formula for how many ways there are to partition a sequence of length n into k contiguous subsequences. I just can't remember.) Michael -- C. M. Sperberg-McQueen Black Mesa Technologies LLC http://blackmesatech.com

Received on Tuesday, 24 May 2022 14:37:06 UTC