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A Gentle Introduction to xml

Allowing options

We wish to enforce the following rules:

Every country must have a name as the first node.
Every country must have a president or a monarch.

Change the xsd so that the xml on the left passes validation and the xml on the right fails validation.

Options

Schema

XML input

Valid	Invalid
<country> <name>United Kingdom</name> <monarch>Elizabeth II</monarch> </country>	<country> <name>Ruritania</name> <monarch>Rudolf</monarch> <monarch>Michael</monarch> <monarch>Rudolf</monarch> <!--Should not allow three monarchs --> </country>
<country> <name>France</name> <president>Sarkozy</president> </country>	<country> <name>Ruritania</name> <president>Robert</president> <monarch>Rudolf</monarch> <!-- Cannot have president and monarch--> </country>
<country> <name>Norway</name> <monarch>Harald</monarch> </country>	<country> <name>Ruritania</name> <!-- Should have president or monarch--> </country>

Valid

Invalid

<country>
  <name>United Kingdom</name>
  <monarch>Elizabeth II</monarch>
</country>

<country>
  <name>Ruritania</name>
  <monarch>Rudolf</monarch>
  <monarch>Michael</monarch>
  <monarch>Rudolf</monarch>
  <!--Should not allow three monarchs -->
</country>

<country>
  <name>France</name>
  <president>Sarkozy</president>
</country>

<country>
  <name>Ruritania</name>
  <president>Robert</president>
  <monarch>Rudolf</monarch>
  <!-- Cannot have president and monarch-->
</country>

<country>
  <name>Norway</name>
  <monarch>Harald</monarch>
</country>

<country>
  <name>Ruritania</name>
  <!-- Should have president or monarch-->
</country>