[YML] RE: YML: A Grand Unification of SAX and DOM? (fwd)
Clark C. Evans
clark.evans at manhattanproject.com
Sat Dec 4 18:52:10 GMT 1999
On Fri, 3 Dec 1999, Don Park wrote:
> What is the advantage of YML over these
> 3. Road Signs
This structure does not seem to be
recursive, given that I'm interpreting
it as I would a processing instruction.
> 2. Parental Guidence
> </sax:cache> </element>
This *could* be logically equivalent
depending upon your interpretation.
Consider this instead:
If the processor would provide random access
to <bar/>, then the answer is no -- this is
not the same as YML.
If, however, you use a keyword like this
to denote that the _immediate children_
are placed into random access storage,
then the answer is almost. In addition, a
mechanism is required to gaurentee that
all of the random access children occur
before the first sequential child.
> 1. Pockets
First, I don't get what you had intended
with <pocket:text>bar</pocket:text>, so
let's consider this replaced with
<text>bar</text> to proceed.
If attributes/children means random/sequential
access, then, of the three, this is the
closest since there seems to be an implicit
requirement that all random access children
occur before sequential access children.
However, you did not use this construct
recursively -- <ch> and <text> were
not marked with the sequential/random
access distinction. If this distinction
were embedded into a binary syntax, then
this type of problem would not occur.
So, here is the YML version of the above,
assuming sequential access for <ch>
and random access for <bar>.
Or, using syntax sugar:
<element att=<ch>val</ch> >
<foo text="bar" />
Major advantage here is that the doubly
recursive syntax drives the processing
choice as to collect attributes together
and provide them via random access (DOM),
or to provide them individually via
sequential access (SAX).
I hope this moves things along!
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