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problem with child text node when constraining other child node types

I'm struggling with whether or not it is possible to represent the
following construct in a dtd.

I have an element X that I want to contain 3 types of child elements.
Child Element A should have a 0 or 1 constraint, Child element B should
have a 0-n constraint. I also want X to be able to contain text,
resulting in xml that the following

<X>
<A/>
<B/>
<B/>
child text of element X also possible
</X?>

I've got the following, but can't seem to figure out a way to also
allow for a text child node. Any help appreciated

<!ELEMENT X (A?, B*)>

Bryan

0
bax (3)
5/17/2006 2:24:06 PM
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Bryan Ax wrote:
> I've got the following, but can't seem to figure out a way to also
> allow for a text child node. Any help appreciated

Declare X as having mixed content.
http://www.w3.org/TR/2004/REC-xml11-20040204/#sec-mixed-content
0
5/17/2006 2:27:57 PM
Looking at this, I don't see a way to constrain it so that A only can
appear once, whereas B can appear multiple times...I think I'm missing
something.

0
bax (3)
5/17/2006 2:36:00 PM
Upon further reading, there doesn't appear to be a way to do this.
Either I go to mixed-content, which is less constraining, or I need to
add a child node to hold the text element.

http://www.devguy.com/fp/XML/dtd.htm

0
bax (3)
5/17/2006 2:56:16 PM

Bryan Ax wrote:


> I have an element X that I want to contain 3 types of child elements.
> Child Element A should have a 0 or 1 constraint, Child element B should
> have a 0-n constraint. I also want X to be able to contain text,

All you can do with mixed contents is described here
   <http://www.w3.org/TR/REC-xml/#sec-mixed-content>
So you could have
   <!ELEMENT X (#PCDATA | A | B)*>
which would define the possible child elements (A, B) but does not allow 
you to constrain their number.


-- 

	Martin Honnen
	http://JavaScript.FAQTs.com/
0
mahotrash (2052)
5/17/2006 3:29:54 PM
Bryan Ax wrote:
> Looking at this, I don't see a way to constrain it

That's correct. Mixed content in DTDs doesn't allow constraining the 
number or order of instances of child elements, only their types. Live 
with that and constrain it in your application code, or switch from DTDs 
to schemas, or (as you suggest) move the text into an element.
0
5/17/2006 4:11:50 PM
Bryan Ax wrote:
> I'm struggling with whether or not it is possible to represent the
> following construct in a dtd.
> 
> I have an element X that I want to contain 3 types of child elements.
> Child Element A should have a 0 or 1 constraint, Child element B should
> have a 0-n constraint. I also want X to be able to contain text,
> resulting in xml that the following
> 
> <X>
> <A/>
> <B/>
> <B/>
> child text of element X also possible
> </X?>
> 
> I've got the following, but can't seem to figure out a way to also
> allow for a text child node. Any help appreciated
> 
> <!ELEMENT X (A?, B*)>

You can't do this in XML, only in SGML.
The content model in SGML would be

    <!element x - - (a?,b*,#pcdata)>

but the XML spec says in Mixed Content, #PCDATA must come first,
and in any case cannot be used in a sequence group.

Is there a reason why this model should use Mixed Content? It's
normally only used for text documents, where the separator is
the vertical bar, eg <!ELEMENT X (#PCDATA|A|B)*> (like HTML
paragraphs). As you need to provide 0/1 and 0/+ constraints,
it looks like you are modelling data, not text. In that case,
put the text in a container, eg

    <!ELEMENT X (A?,B*,C)>
    <!ELEMENT C (#PCDATA)>

This will be much more robust, easier to process, and avoids
any unpleasantness with line-ends in pernicious mixed content.

///Peter
-- 
XML FAQ: http://xml.silmaril.ie/
0
Peter
5/17/2006 9:08:55 PM
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What is "text + text" supposed to do right now? It doesn't seem very useful to me. What about making "text + text" as an equivalent for "text || text"? Most strongly-typed programming languages do this. And MS SQL Server too, I think (CMIIW). -- dave ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org Am Freitag, 8. Oktober 2004 12:57 schrieb David Garamond: > What is "text + text" supposed to do right now? Nothing. > What about making "text + text" as an equivalent for "text > || text"? Most strongly-typed programming languages do this. And MS SQL > Server too, I think (CMIIW). What would this gain except for bloat? It's not like SQL is utterly compatible with any programming language; users will still have to learn all the operators anyway. -- Peter Eisentraut http://developer.postgresql.org/~petere/ ---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match Peter Eisentraut wrote: >>What is "text + text" supposed to do right now? > > Nothing. Then are these bugs? (7.4.5 and 8.0.0beta1 give same results). Frankly, the current behaviour is quite strange to me. ------------------ =...

Problems with getting text from node (xalan)
I have a node that I'd call a text node, but the parser disagrees. At any rate, I'd like to get the text out of it. (It is some text with infrequent markup. I'm using Xalan and Java. getNodeValue() returns null, and isTextNode(n) returns false. Here is the only code I've been able to use to get the text out: ByteArrayOutputStream baotc = new ByteArrayOutputStream(); StreamResult out = new StreamResult(new OutputStreamWriter(baotc)); serializer.transform(new DOMSource(n), out); String tt = baotc.toString(); It actually gives the text but has a jarbled(to me) footer and header. I'm doing something wrong of course. Thanks for your help. LNMEgo (btw, I did post this on the forums at sun, but didn't get a response. so, yes I did cross post, but that forum is pretty unresponsive. thanks) I realized that it was due to another line of code that I have since fixed. Thanks to anyone who had tried to think of a solution. -LNMEgo LNMEgo@hotmail.com (Jeff) wrote in message news:<ce9e21d9.0309202308.25c42a2a@posting.google.com>... > I have a node that I'd call a text node, but the parser disagrees. At > any rate, I'd like to get the text out of it. (It is some text with > infrequent markup. > > I'm using Xalan and Java. getNodeValue() returns null, and > isTextNode(n) returns false. Here is the only code I've been able to > use to get the text out: > > ByteArrayOutputStream baotc = new ByteArr...

editor for editing xml text nodes
We have xml documents which contain text imbedded as text content in some xml structures. These documents need to be translated by human translators from English into, for example, Chinese. We would like the translator to use an editor which shows him only the text content of the xml document, or gives him only editing access to the text content. The translator should be unable to touch or modify the xml tags, so that it is guaranteed that the xml-tags are unchanged when the translator returns the translated document. The translator simply replaces all English text accessible to him into Chinese text. Does anyone know an xml editing tool which has this feature, of allowing only modification to the text node content? Alois Zreindl wrote: > We have xml documents which contain text imbedded as text content in > some xml structures. > > These documents need to be translated by human translators from English > into, for example, Chinese. > > We would like the translator to use an editor which shows him only the > text content of the xml document, or gives him only editing access to > the text content. I am working on exactly this right now. It leaves the elements in element content inviolable, but allows element markup in mixed content (the only thing a translator should be touching). Please contact me by email to discuss this further. > The translator should be unable to touch or modify the xml tags, so that > it is guara...

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