XML Schema, choice and other stuff

[Don Kiddick]

I'm trying to validate a login response message. A successfull response looks like this :
<FoXML version="2.0" descriptor="bb.activetrader.response">
<TraderResponse type="loginack" login="hileyw">
<User internal_user_id="644" global_staff_id="47088981" ldap="hileyw" name="Hiley, Wayne" sales_team_id="" sales_team="" user_type_id="1" read_only="0" valid="1" active="0" modified_date="Mar 23 2004 3:05PM" modified_by="TraderLoginServer" sales_list_member="0" oneview_sales_team_id="" oneview_sales_team="" see_all_orders="0" />
</TraderResponse>
</FoXML>
and an unsuccessful response looks like this :
<FoXML version="2.0" descriptor="bb.activetrader.response">
<TraderResponse type="loginnack" reason="Not a valid trader" login="vdfvdfvdv" />
</FoXML>

This is my first attempt at an xml schema and I'm getting a bit stuck. This my top level bit.It basically says I get a standard header, then either one of the two messages.
<xsd:element name="FoXML">
<xsd:complexType>
<xsd:attribute name="version" type="xsd:string" />
<xsd:attribute name="descriptor" type="xsd:string" />
</xsd:complexType>
<xsd:choice>
<xsd:element name="TraderResponse" type="xsd:loginAccepted" />
<xsd:element name="TraderResponse" type="xsd:loginNotAccepted" />
</xsd:choice>
</xsd:element>
Will the choice bit work ? I think it will fail because the elements are called the same thing but can be formed differently.
This XML is not set in stone so I can change to make it easier to parse if that would make more sense. I've not done much xml so I'm a bit confused !
thanks,
D.

[Don Kiddick]

bumpity-bump
Anyone got any advice ?

[Lasse Koskela]

That's an interesting question -- I hadn't encountered such a situation before.
I see three options here:
1) browse a book
2) browse the spec
3) test it
Right now, I'm headed towards the bed so I'm not going to do even the last one myself.

[G Buddha]

Hi Don,
You may try this:
XSD:
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="unqualified" attributeFormDefault="unqualified">
<xsd:complexType name="ValidityCheck">
<xsd:attribute name="type" type="xsd:string"/>
<xsd:attribute name="login" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="loginNotAccepted">
<xsd:complexContent>
<xsd:extension base="ValidityCheck">
<xsd:attribute name="reason" type="xsd:string"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:complexType name="loginAccepted">
<xsd:complexContent>
<xsd:extension base="ValidityCheck">
<xsd:sequence>
<xsd:element name="User">
<xsd:complexType>
<xsd:simpleContent>
<xsd:extension base="xsd:string">
<xsd:attribute name="internal_user_id" type="xsd:integer"/>
<xsd:attribute name="global_staff_id" type="xsd:integer"/>
<xsd:attribute name="ldap" type="xsd:string"/>
<xsd:attribute name="name" type="xsd:string"/>
</xsd:extension>
</xsd:simpleContent>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:element name="TraderResponse" type="ValidityCheck" abstract="true"/>
<xsd:element name="loginNotAccepted" Type="loginNotAccepted" substitutionGroup="TraderResponse"/>
<xsd:element name="loginAccepted" type="loginAccepted" substitutionGroup="TraderResponse"/>
<xsd:element name="FoXML">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="TraderResponse" maxOccurs="1"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
Which will work for your scenario...
The XML file will look like:
Valid Login XML:
----------------
<?xml version="1.0" encoding="UTF-8"?>
<FoXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="sameElementName.xsd">

<TraderResponse type="loginack" login="vdfvdfvdv" xsi:type="loginAccepted">
<User
internal_user_id="644"
global_staff_id="47088981"
ldap="hileyw"
name="Hiley, Wayne"
/>
</TraderResponse>
</FoXML>

Invalid Login XML:
------------------
<?xml version="1.0" encoding="UTF-8"?>
<FoXML xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="sameElementName.xsd">

<TraderResponse type="loginack" login="vdfvdfvdv" reason="Not a valid trader" xsi:type="loginNotAccepted"/>
</FoXML>

You can modify it to ur requirement.. but make sure all the complext type declaration and the element declaration are to be global.
I guess I answered your question!

[Lasse Koskela]

Welcome to the JavaRanch, Vaidya

[Don Kiddick]

Andrew, thanks a lot for spending the time to help me. I've checked it and it works, but I'm not sure how yet, so I'll have to go through and have a look....maybe coming back with questions !
cheers,
D.

[Don Kiddick]

oh, Lasse, cheers for the link too, that's now in my "favourites"
D.

[Lasse Koskela]

Originally posted by Don Kiddick:
oh, Lasse, cheers for the link too, that's now in my "favourites"
D.

Want another one?