If you really want to enforce this you could define subtypes of
interpretationsTyp that disallow some of the children, for example
interpretationsTyp-no-u would disallow a u (at any depth) and
interpretationsTyp-no-ub would disallow both u and b (at any depth). 

Michael Kay
http://www.saxonica.com

> -----Original Message-----
> From: xmlschema-dev-request@w... 
> [mailto:xmlschema-dev-request@w...] On Behalf Of Markus Gamperl
> Sent: 10 February 2007 16:05
> To: xmlschema-dev@w...
> Subject: how to define a recursive type depth?
> 
> 
> Hi.
> 
> In an element "interpret" I want to allow normal text and the 
> "b" (bold) "u" (underline) and the "br" tag.
> 
> Example:
> <interpret>
> this is a normal text.
> this is a <b>bold</b> text <br/>
> this is a <b><u>bold + underline</u></b> text </interpret>
> 
> I have defined the following schema:
> 
> ....
> <xs:complexType name="interpretationsTyp" mixed="true">  <xs:choice>
>   <xs:element name="b" type="interpretationsTyp" 
> minOccurs="0" maxOccurs="unbounded"/>
>   <xs:element name="u" type="interpretationsTyp" 
> minOccurs="0" maxOccurs="unbounded"/>
>   <xs:element name="br" minOccurs="0" maxOccurs="unbounded">
> 	<xs:complexType/>
>   </xs:element>
>  </xs:choice>
> </xs:complexType>
> ....
> 
> How can I define the cursion depth? Because the following 
> shouldn't be allowed (which is now available):
> <b><u><b><u>text</u></b></u></b>
> 
> Thanks
> Markus
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