Re: What does it mean to lexically distinguish significantand

From: John Cowan <johnwcowan@gmail.com>
To: Michael Kay <mike@saxonica.com>
Date: Fri, 15 Sep 2017 18:59:32 -0400

Play the video

On Wed, Sep 13, 2017 at 7:45 AM, Michael Kay <mike@saxonica.com> wrote:

What I meant by the phrase is that when you see

<a>
<b/>
</a>

there is nothing within the document itself to tell you whether the whitespace is significant; you typically need external information (e.g. a schema or DTD, or just outside knowledge) to know.

Well, if xml:space="preserve" is present you know it's significant, and if both non-whitespace children and element children are present, the betting is that it's significant. Otherwise, you're right, you don't know.

My utility DTDcrunch reduces an external DTD subset to just enough declarations, suitable for use as an internal subset, to provide the infoset effects of the DTD (as opposed to validation information). Specifically:

1) An internal general entity declaration is preserved.

2) A non-CTEXT attribute declaration is preserved.

3) A CTEXT attribute declaration with a default or fixed value is preserved.

4) An element declaration with element-only content is preserved in the reduced form <!ELEMENT foo (foo)>.

The resulting document has the same infoset as the original when parsed with a non-validating parser.

John Cowan http://vrici.lojban.org/~cowan cowan@ccil.org

Man has no body distinct from his soul, for that called body is a portion

of the soul discerned by the five senses, the chief inlets of the soul

in this age. --William Blake

References:
- What does it mean to lexically distinguish significant andinsignificant whitespace?
  - From: "Costello, Roger L." <costello@mitre.org>
- Re: What does it mean to lexically distinguish significant and insignificant whitespace?
  - From: Michael Kay <mike@saxonica.com>

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