Middle way between XSD all and XSD sequence
I'm defining a user element with XSD. For this example, a user has a name, email and one or more nationalities. I've tried:
<xs:all>
<xs:element name="name" blabla />
<xs:element name="email" blabla />
<xs:element name="nationality" minOccurs="1" maxOccurs="unbounded" />
</xs:all>
However, that is illegal. Apparently elements inside an "All" can only occur one time (or not at all). I could fix this by changing the All to a Sequence, but then people would have to enter the properties in the exact order, which I actually don't care about.
Is there a combination of these two available? Not according to http://www.w3schools.com/Schema/schema_complex_indicators.asp, but maybe it's hidden (or my inexperienced eyes don't see it).
By intuition, I also tried:
<xs:all>
<xs:element name="name" blabla />
<xs:element name="email" blabla />
<xs:sequence>
<xs:element name="nationality" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:all>
But that's unfortunately invalid.
Here is the current, real, piece of XSD:
<!-- user -->
<xs:complexType name="user">
<xs:sequence>
<xs:element name="firstname" type="xs:string" minOccurs="1" maxOccurs="1" />
<xs:element name="appendix" type="xs:string" minOccurs="0" maxOccurs="1" />
<xs:element name="lastname" type="xs:string" minOccurs="1" maxOccurs="1" />
<xs:element name="address" type="xs:string" minOccurs="1" maxOccurs="1" />
<xs:element name="zipcode" type="xs:string" minOccurs="1" maxOccurs="1" />
<xs:element name="city" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="username" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="email" type="xs:string" minOccurs="1" maxOccurs="1"/>
<xs:element name="country" type="country" minOccurs="1" maxOccurs="1"/>
<xs:element name="nationality" type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
Solution 1:
Could you just turn your "nationality" thingie into its own complexType and then use that new complex type inside your xs:all?
<xs:complexType name="NationalityType">
<xs:sequence>
<xs:element name="nationality" minOccurs="1" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
<xs:all>
<xs:element name="name" blabla />
<xs:element name="email" blabla />
<xs:element name="nationalities" type="NationalityType" />
</xs:all>
I don't have anything at hand to test this, so this is really just off the top of my head..... give it a try!
EDIT: tested it by now - it works, the only minor price to pay is that your XML will have to look something like this:
<....>
<email>......</email>
<nationalities>
<nationality>ABC</nationality>
<nationality>CDE</nationality>
</nationalities>
<name>.....</name>
</.....>
So you get an extra node that will contain the arbitrary long list of <nationality>
items.
Marc
Solution 2:
Just come across the a similar problem (I wanted to have any number of each element in any order) and solved it with a sequence of choices. Using the example above:
<?xml version='1.0' encoding='UTF-8'?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name='user'>
<xs:complexType>
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:choice>
<xs:element name="name" type="xs:string" />
<xs:element name="email" type="xs:string" />
<xs:element name="nationality" />
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
This allows you to have any number of name, email and nationality in any order.
Solution 3:
I think what you're looking for would go against the intent of XML. It would seems strange to have a valid XML fragment like this:
<user>
<nationality/>
<name/>
<nationality/>
<email/>
<nationality/>
</user>
It sounds like you're asking for something like what marc_s proposed:
<user>
<name/>
<email/>
<nationality/>
<nationality/>
<nationality/>
<user>
which needs to get pushed into:
<user>
<name/>
<email/>
<nationalities>
<nationality/>
<nationality/>
<nationality/>
</nationalities>
<user>
Solution 4:
Your code should be valid in XSD 1.1. For XSD 1.0 you have to find a workaround.
Solution 5:
For XSD 1.0 the suggestion from leppie works.
The XSD
<?xml version='1.0' encoding='UTF-8'?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name='user'>
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string" />
<xs:element name="email" type="xs:string" />
<xs:choice minOccurs='0' maxOccurs='unbounded'>
<xs:element name="nationality" />
</xs:choice>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
A sample XML document that validates against the schema
<user>
<name>Name</name>
<email>[email protected]</email>
<nationality>Italian</nationality>
<nationality>Japanese</nationality>
<nationality>Alien</nationality>
</user>
And validation e.g. using xmllint
xmllint --noout --schema test.xsd test.xml
test.xml validate