XSD choice inside all - xsd

Question

You can't put choice tag inside the all tag. So, is there any workaround to get this functionallity?
For example, I have<settings> tag like:
<settings>
<logging />
<sending />
<useonly />
</settings>
Or something like
<settings>
<logging />
<notuseonly />
<sending />
</settings>
So I want to prevent <useonly> and <notuseonly> showing up together, while the order is not important. And if allowed, in XSD it would look like:
<xs:all>
<xs:element minOccurs="0" maxOccurs="1" ref="sending" />
<xs:element minOccurs="0" maxOccurs="1" ref="logging" />
<xs:choice>
<xs:element minOccurs="0" maxOccurs="1" ref ="useonly" />
<xs:element minOccurs="0" maxOccurs="1" ref ="notuseonly" />
</xs:choice>
</xs:all>
Any thoughts?

Answer 1

Check this link: http://www.w3.org/wiki/Needs_choice_inside_all
I summarize for you the solutions proposed:
One solution is to wrap the element that can change inside another:
<xsd:all>
<xsd:element minOccurs="0" maxOccurs="1" ref="sending" />
<xsd:element minOccurs="0" maxOccurs="1" ref="logging"/>
<xsd:element minOccurs="0" maxOccurs="1" ref ="usetype"/>
</xsd:all>
<xsd:element name="usetype">
<xsd:complexType>
<xsd:choice>
<xsd:element ref="useonly"/>
<xsd:element ref="notuseonly"/>
</xsd:choice>
</xsd:complexType>
</xsd:element>
The other one is to use a substitution group:
<xsd:all>
<xsd:element ref="sending"/>
<xsd:element ref="logging"/>
<xsd:element ref="usetype"/>
</xsd:all>
</xsd:complexType>
<xsd:element name="usetype" abstract="true"/>
<xsd:element name="useonly" substitutionGroup="usetype"> ... </xsd:element>
<xsd:element name="notuseonly" substitutionGroup="usetype"> ... </xsd:element>