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Re: Intepretation of choice compositor and occurence into xml

• To: Hess Yvan <yvan.hess@i...>
• Subject: Re: Intepretation of choice compositor and occurence into xml schema
• From: "Chiusano Joseph" <chiusano_joseph@b...>
• Date: Wed, 04 Feb 2004 22:09:16 -0500
• Cc: "'xml-dev@l...'" <xml-dev@l...>
• Organization: Booz Allen Hamilton
• References: <DF7EC83D7AFBD411965B0008C7596EC5E0D41C@i...>

The first schema could result in the following possibilities:

(1) No elements (minOccurs="0")
(2) One element - either A, B, or C (minOccurs="1")
(3) Any of the following combinations (minOccurs="2"):
	(a) Element "A" followed by element "A"
	(b) Element "A" followed by element "B"
	(c) Element "A" followed by element "C"
	(d) Element "B" followed by element "A"
	(e) Element "B" followed by element "B"
	(f) Element "B" followed by element "C"
	(g) Element "C" followed by element "A"
	(h) Element "C" followed by element "B"
	(i) Element "C" followed by element "C"

For the second schema, it's more complex - given the "unbounded" facet
value, you would have many more possible combinations, using the same
general technique as I listed above for schema 1. You could potentially
have no elements (due to the minOccurs="0" on each element within the
choice), an infinitely long set of element "A" (same for elements "B"
and "C"), or a set of A/B/A/B/A/C/B/A (just random choices), etc.

Hope this helps.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World

Hess Yvan wrote:
> 
> It is not clear for me how to interpet attribute elements
> minOccurs/maxOccurs into <choice> element having sub-elements that also have
> minOccurs/maxOccurs attributes as for example
> 
> Schema 1:
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> elementFormDefault="qualified" attributeFormDefault="unqualified">
>    <xs:element name="document">
>       <xs:complexType>
>          <xs:choice minOccurs="0" maxOccurs="2">
>             <xs:element name="A" minOccurs="1" maxOccurs="1"/>
>             <xs:element name="B" minOccurs="1" maxOccurs="1" />
>             <xs:element name="C" minOccurs="1" maxOccurs="1"/>
>          </xs:choice>
>       </xs:complexType>
>    </xs:element>
> </xs:schema>
> 
> Schema 2:
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> elementFormDefault="qualified" attributeFormDefault="unqualified">
>    <xs:element name="document">
>       <xs:complexType>
>          <xs:choice minOccurs="1" maxOccurs="unbounded">
>             <xs:element name="A" minOccurs="0" maxOccurs="1"/>
>             <xs:element name="B" minOccurs="0" maxOccurs="1" />
>             <xs:element name="C" minOccurs="0" maxOccurs="1"/>
>          </xs:choice>
>       </xs:complexType>
>    </xs:element>
> </xs:schema>
> 
> Schema 3:
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> elementFormDefault="qualified" attributeFormDefault="unqualified">
>    <xs:element name="document">
>       <xs:complexType>
>          <xs:choice minOccurs="1" maxOccurs="unbounded">
>             <xs:element name="A" minOccurs="1" maxOccurs="1"/>
>             <xs:element name="B" minOccurs="0" maxOccurs="3" />
>             <xs:element name="C" minOccurs="0" maxOccurs="1"/>
>          </xs:choice>
>       </xs:complexType>
>    </xs:element>
> </xs:schema>
> 
> I tried to find more information about this subject on the web, but I didn't
> succeed.
> 
> Can somebody give me more information about how to interpret schema 1,
> schema 2 and schema 3 ?
> 
> Thanks for your help.
> 
> Yvan
> 
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• References:
  • Intepretation of choice compositor and occurence into xml schema
    • From: Hess Yvan <yvan.hess@i...>

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