Document template test 10

The heart of test 10 is this expression:

   {{{/doc/p}}}

There are two possible interpretations:

  "{" "/doc/p" "}"

or

  "{" "/doc/p}" "}"

The former yields a valid expression, the latter an invalid one.

The problem I have is this case:

  { concat('{{', $foo, '}}') }

There are two possible interpetations here too:

  " concat('{', $foo, '" ... error because there's an unbalanced "}"

or

  " concat('{', $foo, '}') "

If we say that "}" ends an expression when we're inside one, then the
first expression is valid and the second is not. If we say that "}}"
is matched even when we're inside an expression then the first
expression is invalid and the second is valid.

On the whole, I prefer the latter interpretation. In either case,
there are some sequences of values that cannot be constructed using
the document-template step. We'd have to have more complex parsing
rules to avoid that problem, but I'd rather not.

                                        Be seeing you,
                                          norm

-- 
Norman Walsh
Lead Engineer
MarkLogic Corporation
www.marklogic.com