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POHow would you describe this in XML/XSD?
 

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  1. POHow would you describe this in XML/XSD?
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    <p>I am not sure what would be a good XML structure for the following...</p> <p>Assume that a field type, say &lt;person&gt;, can have different "flavors", e.g. either the person is a local reference defined only by some ID, or it is a global reference with various address elements associated. What would be a good XML structure for this so that it becomes easy to describe in a schema (an xsd file)?</p> <p>I see two strategies - bot both with some major drawbacks:</p> <p>Either the person type is defied as a separate element, say &lt;type&gt;, but then I guess a schema cannot tell which of the type specific fields that are mandatory:</p> <pre><code>&lt;person&gt; &lt;type&gt;local&lt;/type&gt; &lt;id&gt;12345&lt;/id&gt; &lt;/person&gt; &lt;person&gt; &lt;type&gt;global&lt;/type&gt; &lt;name&gt;Some Name&lt;/name&gt; &lt;address&gt;Some Street 42&lt;/address&gt; &lt;city&gt;Some City&lt;/some&gt; &lt;/person&gt; </code></pre> <p>In this case &lt;id&gt; should only be mandatory for "local" person types, and similarly with the fields for "global" person types.</p> <p>The other strategy is to define a new node type for each person sub-type, but then we cannot tell that each sub-type is in fact just a flavor of &lt;person&gt;:</p> <pre><code>&lt;personLocal&gt; &lt;id&gt;12345&lt;/id&gt; &lt;/personLocal&gt; &lt;personGlobal&gt; &lt;name&gt;Some Name&lt;/name&gt; &lt;address&gt;Some Street 42&lt;/address&gt; &lt;city&gt;Some City&lt;/some&gt; &lt;/personGlobal&gt; </code></pre> <p>What is a good strategy for modeling structures like this?</p>
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