CODEWITHSUNDEEP
xmlxsdlibxml2
Dragomir Ivanov
Dragomir Ivanov

Reputation: 544

Setting restriction to `mixed` element

Hello I want to be able to define something like this:

<Infos>
      <Mileage>9987
          <UseIn>POS_DISPLAY</UseIn>
          <UseIn>READER_DISPLAY</UseIn>
      </Mileage>
</Infos>

Mileage is mixed type. 9987 is its value, and UseIn are some properties. The problem is that I can't find a way to define restriction for Mileage content.

Is there any way to define the structure above, without falling back to:

<Infos>
      <Mileage>
          <MileageValue>9987</MileageValue>
          <UseIn>POS_DISPLAY</UseIn>
          <UseIn>READER_DISPLAY</UseIn>
      </Mileage>
</Infos>

Upvotes: 0

Views: 54

Answers (1)

C. M. Sperberg-McQueen
C. M. Sperberg-McQueen

Reputation: 25034

For historical reasons I won't bother to describe, XSD types with mixed content allow character data to appear at any location. It's easy to define a type that allows the structure you show, but it's not so easy to define a type that allows what you show while rejecting variants like

<Mileage>
    <UseIn>POS_DISPLAY</UseIn>
    9987
    <UseIn>READER_DISPLAY</UseIn>
</Mileage>

or

<Mileage>99
    <UseIn>POS_DISPLAY</UseIn>
    8
    <UseIn>READER_DISPLAY</UseIn>
    7
</Mileage>

My advice, fwiw, is to fall back to the second design, which will work better with most XML infrastructure.

Upvotes: 3

Related Questions