Home/ Questions/Q 6844821
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-27T00:25:30+00:00

I am creating a schema for an xml coming from an external system. I

  • 0

I am creating a schema for an xml coming from an external system. I have a problem modelling this type:

<main>
...
  <Foo TYPE="Numeric"/>
  <Bar TYPE="Numeric">12.0</Bar>
...
</main>

I have create a type extending double:

<xs:complexType name="myNumeric">
  <xs:simpleContent>
    <xs:extension base="xs:double">
      <xs:attribute name="TYPE" type="xs:string"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>

....

<xs:element name="Foo" type="myNumeric" />
<xs:element name="Bar" type="myNumeric" />

However this is not good enough, when I am try to validate the schema I got an error complaining that: ” is not a valid value for ‘double’.

Any hints?

Thanks

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    xs:double cannot have an empty sting as a value. If you want to mark this type as a “null” then you can use xsi:nil=”true” to indicate that this is an “empty” double:

    <Foo TYPE="Numeric" xsi:nil="true" />

    To allow this use nillable=”true” in your schema 

    <xs:element name="Foo" type="myNumeric" nillable="true" />

    You will need to include a reference to the XML Schema instance namespace in your xml instance. 

    <MyRoot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ... >
...
</MyRoot>
    • 0