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DTD? Is address element block or inline?
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Subject Author Date
DTD? Is address element block or inline? Eric Lindsay 12-15-2005
Posted by Eric Lindsay on December 15, 2005, 10:16 pm
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I'm trying to learn how to read a DTD I wanted to use,
http://www.w3.org/TR/html4/strict.dtd
to ensure I was treating each element correctly in terms of being block,
inline, or flow (either).

<!ENTITY % block
"P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

<!ENTITY % flow "%block; | %inline;">

The way I read that was the block elements included ADDRESS. However
the next item related to ADDRESS was

<!ELEMENT ADDRESS - - (%inline;)* -- information on author -->
<!ATTLIST ADDRESS
%attrs; -- %coreattrs, %i18n, %events --
>

This seemed to me to be saying that the element ADDRESS requires opening
and closing tags, is an INLINE element that can be left out, or used one
or more times.

Can anyone explain to me what I am misunderstanding?

--
http://www.ericlindsay.com

Posted by Steve Pugh on December 15, 2005, 8:12 am
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Eric Lindsay wrote:
> I'm trying to learn how to read a DTD I wanted to use,
> http://www.w3.org/TR/html4/strict.dtd
> to ensure I was treating each element correctly in terms of being block,
> inline, or flow (either).
>
> <!ENTITY % block
> "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
> BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">
>
> <!ENTITY % flow "%block; | %inline;">
>
> The way I read that was the block elements included ADDRESS. However
> the next item related to ADDRESS was
>
> <!ELEMENT ADDRESS - - (%inline;)* -- information on author -->
> <!ATTLIST ADDRESS
> %attrs; -- %coreattrs, %i18n, %events --
> >
>
> This seemed to me to be saying that the element ADDRESS requires opening
> and closing tags, is an INLINE element that can be left out, or used one
> or more times.

No, it's saying that the content of the address element must be
%inline.

Steve


Posted by Gus Richter on December 15, 2005, 12:34 pm
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Eric Lindsay wrote:
> I'm trying to learn how to read a DTD I wanted to use,
> http://www.w3.org/TR/html4/strict.dtd
> to ensure I was treating each element correctly in terms of being block,
> inline, or flow (either).

There are just block or inline elements.
Flow is an "entity" which may be either inline or block.

> <!ENTITY % block
> "P | %heading; | %list; | %preformatted; | DL | DIV | NOSCRIPT |
> BLOCKQUOTE | FORM | HR | TABLE | FIELDSET | ADDRESS">

This defines which elements are block type.
The %heading, %list and %preformatted entities are expanded elewhere
(permissable content type for each).

> <!ENTITY % flow "%block; | %inline;">

The % flow entity is defined to be either Block or Inline.

> The way I read that was the block elements included ADDRESS.

Correct. The ADDRESS element is defined to be block type.

> However
> the next item related to ADDRESS was
>
> <!ELEMENT ADDRESS - - (%inline;)* -- information on author -->
> <!ATTLIST ADDRESS
> %attrs; -- %coreattrs, %i18n, %events --
> >

The ADDRESS element may only _contain_ inline element(s) zero or more times.

> This seemed to me to be saying that the element ADDRESS requires opening
> and closing tags, is an INLINE element that can be left out, or used one
> or more times.
>
> Can anyone explain to me what I am misunderstanding?

How to read the HTML DTD:
<http://www.w3.org/TR/html4/intro/sgmltut.html#h-3.3>

--
Gus

Posted by Eric Lindsay on December 16, 2005, 6:33 am
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> Eric Lindsay wrote:
> > I'm trying to learn how to read a DTD I wanted to use,
> > http://www.w3.org/TR/html4/strict.dtd
> >
> > <!ELEMENT ADDRESS - - (%inline;)* -- information on author -->
>
> The ADDRESS element may only _contain_ inline element(s) zero or more times.
> > Can anyone explain to me what I am misunderstanding?

Thank you. The _contain_ was what I hadn't noticed and understood.

> How to read the HTML DTD:
> <http://www.w3.org/TR/html4/intro/sgmltut.html#h-3.3>

I think the explanation of how to read the HTML DTD was what I was
having trouble with. I was reading (well, misreading, I guess)
http://www.w3.org/TR/REC-html40/struct/global.html which seems about the
same as the reference you kindly provided.

--
http://www.ericlindsay.com

Posted by Eric B. Bednarz on December 15, 2005, 2:26 pm
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> I'm trying to learn how to read a DTD I wanted to use,
> http://www.w3.org/TR/html4/strict.dtd

Why? It hasn't any relevance for HTML. User agents who try to
implement the HTML spec at all aim at its prose including all attached
errors and are subsequently incompatible with the normative syntax.

Anyway, if you want to understand SGMLese, locate a reference with some
considerable clue-density (IOW, avoid W3C specs like the plague). A
good place to start for the basics might be

<http://www.hti.umich.edu/cgi/t/tei/tei-idx?type=extoc&byte=71769>

Or just wade through

<http://xml.coverpages.org/general.html>


I don't see the point, though, except if you have plans to mangle a
private DTD for usage in SGML aware authoring tools.


> <!ELEMENT ADDRESS - - (%inline;)* -- information on author -->

> This seemed to me to be saying that the element ADDRESS requires opening
> and closing tags, is an INLINE element

It can *contain* none or more instances of whatever is lumped together
in the parameter entity inline (it would be a good thing to forget about
the inconsistently used terms 'block' and 'inline' altogether in an HTML
context, BTW).


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