Hi Roger,

Ah, I see now that it's not valid with respect to the schema.
ie. the problem with <tag/> is not that it's an illegal string, but that it's not a string at all.


   <xsd:element 
    name="Author" type="xsd:string" />

   <Author> <tag/> 
  </Author> 

> However, that's not the same thing as giving Author a non-string value.
Being pedantic, I guess <tag/> is a "non-string" value.

PS: I think you meant "not valid", instead of "non-well-formed" - I always get those two confused, and had to look it up.



Brendan

On 10/02/07, Costello, Roger L. <costello@m...> wrote:





Hi Brendan,
 
I think that's an example of <Author> having 
non-well-formed content, not an example of <Author> having an illegal 
string value.  Certainly if the "<" is escaped then <Author> is 
legal:
 
    <Author> &lt;tag/> 
</Author>
 
I'm not sure what the answer is.
 
/Roger


  
  
  From: Brendan 
  [mailto:melbourne.research@g...] 
Sent: Friday, February 09, 
  2007 1:29 PM
To: Costello, Roger L.
Subject: Re: [xml-dev] 
  Brain Teaser: Element Author is of type xsd:string, what's an illegal value of 
  Author?


  What about
   <Author> <tag/> 
  </Author>
Isn't an element a non-string value, and therefore 
  illegal?


Brendan Macmillan


  

  <xsd:element 
    name="Author" type="xsd:string" />

<?xml 
    version="1.0"?>
<Book>
        <Author>...</Author>
</Book>

Question: 
    what is an invalid (non-string) value for <Author>?