[xsd-users] Messages and its sub types in the message body

[Shiao, Renfu]

Thanks Boris! Here is another question, I took a sample XML from W3Schools, generated .xsd file from it, and feed the xsd file to "xsd cxx-tree". I have an error message of "Invalid element name 'f:table'".  I must missed something:)

The XSD file is as the following:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
        <xs:element name="f:table">
              <xs:complexType>
                     <xs:sequence>
                            <xs:element name="f:name" type="xs:string"></xs:element>
                            <xs:element name="f:width" type="xs:int"></xs:element>
                            <xs:element name="f:length" type="xs:int"></xs:element>
                        </xs:sequence>
                     <xs:attribute name="xmlns:xs" type="xs:string"></xs:attribute>
                     <xs:attribute name="xmlns:f" type="xs:string"></xs:attribute>
                 </xs:complexType>
          </xs:element>
   </xs:schema>

Sample XML data:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
        <xs:element name="f:table">
              <xs:complexType>
                     <xs:sequence>
                            <xs:element name="f:name" type="xs:string"></xs:element>
                            <xs:element name="f:width" type="xs:int"></xs:element>
                            <xs:element name="f:length" type="xs:int"></xs:element>
                        </xs:sequence>
                     <xs:attribute name="xmlns:xs" type="xs:string"></xs:attribute>
                     <xs:attribute name="xmlns:f" type="xs:string"></xs:attribute>
                 </xs:complexType>
          </xs:element>
   </xs:schema>

Best regards,

Renfu Shiao

________________________________
From: Boris Kolpackov <boris at codesynthesis.com>
Sent: Tuesday, April 21, 2020 9:32 AM
To: Shiao, Renfu <Renfu.Shiao at navcanada.ca>
Cc: xsd-users at codesynthesis.com <xsd-users at codesynthesis.com>
Subject: [EXT] Re: [xsd-users] Messages and its sub types in the message body

Shiao, Renfu <Renfu.Shiao at navcanada.ca> writes:

> I have a general message definition which has a header and a body, within
> the body, it could be any one of the sub message types:
>
> <foo:Message>
> <foo:header></foo:header>
> <foo:body>
> <foo:flight>...</foo:flight>  (Could be a different message type  <foo:weather>...</foo:weather>)
> </foo:body>
> </foo:Message>
>
> I can access Message.body(), but how can I access the flight or weather
> object within the message body?

You didn't say how this is arranged in your schema (as xs:any,
polymorphism, etc). If it's done with wildcards (xs:any), see the
`wildcard` example for how handle this. If it's via polymorphism,
then see the `polymorphism` example. There is also an ad hoc
approach that can be used with either as shown in the `messaging`
example.

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