Schema question

[Robert Dailey]

Take the following XML:
<Frame type="Image" id="frame1">
<Draw/>
</Frame>

<Frame type="Text" id="frame2">
<Print/>
</Frame>
Is there a way in Schema to specify that the "Frame" element is
different (and thus requires different child elements) depending on
the value of an attribute (specifically the "type" attribute)?

[Joseph Kesselman]

Robert Dailey wrote:

Is there a way in Schema to specify that the "Frame" element is
different (and thus requires different child elements) depending on
the value of an attribute (specifically the "type" attribute)?

Presence or absence, maybe. Value, I don't think so. Some of the other
schema(-like) languages do support that, or you can enforce that
constrating in the application code...
--
Joe Kesselman / Beware the fury of a patient man. -- John Dryden

[Robert Dailey]

On Jul 16, 1:05 pm, Joseph Kesselman <[e-mail]>
wrote:

Robert Dailey wrote:

Is there a way in Schema to specify that the "Frame" element is
different (and thus requires different child elements) depending on
the value of an attribute (specifically the "type" attribute)?

Presence or absence, maybe. Value, I don't think so. Some of the other
schema(-like) languages do support that, or you can enforce that
constrating in the application code...

--
Joe Kesselman / Beware the fury of a patient man. -- John Dryden

Thank you for your reply, it was the answer I was looking for.

I would also like to ask if it's possible to make a schema accept
either of the following attribute combinations for a single element:

<Offset x="0" y="0"/>
<Offset var="myvar"/>

Is this possible?

[usenet]

On 16 Jul, 20:36, Robert Dailey <[e-mail]:

On Jul 16, 1:05 pm, Joseph Kesselman <[e-mail]>
wrote:

Robert Dailey wrote:

Is there a way in Schema to specify that the "Frame" element is
different (and thus requires different child elements) depending on
the value of an attribute (specifically the "type" attribute)?

Presence or absence, maybe. Value, I don't think so. Some of the other
schema(-like) languages do support that, or you can enforce that
constrating in the application code...

--
Joe Kesselman / Beware the fury of a patient man. -- John Dryden

Thank you for your reply, it was the answer I was looking for.

I would also like to ask if it's possible to make a schema accept
either of the following attribute combinations for a single element:

<Offset x="0" y="0"/>
<Offset var="myvar"/>

Is this possible?

In schema you can effectively only specify the union of the two
types. As a result things like <Offsett x="0" var="myvar"/would
also validate. You could apply additional constraints at the
application level. XSD1.1 is due to improve onthis and Relax-NG
supports what you want.

HTH,

Pete.
--
=============================================
Pete Cordell
Codalogic Ltd
for XML Schema to C++ data binding visit
http://www.codalogic.com/lmx/
=============================================