Databases
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    <p><strong>If you're using XML Schema 1.1</strong>, you can <a href="http://www.ibm.com/developerworks/library/x-xml11pt2/" rel="nofollow">specify co-occurrence constraints</a> via XPath 2.0 using <code>xs:assert</code> like this (untested):</p> <pre><code>&lt;xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="my/sample/namespace" xmlns="my/sample/namespace" elementFormDefault="qualified"&gt; &lt;xs:element name="FIVR"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="meal" minOccurs="1" maxOccurs="1"&gt; &lt;xs:complexType&gt; &lt;xs:sequence&gt; &lt;xs:element name="media" minOccurs="1" maxOccurs="1"&gt; &lt;xs:complexType&gt; &lt;xs:choice&gt; &lt;xs:element name="image2D" minOccurs="5" maxOccurs="5" &gt; &lt;xs:complexType&gt; &lt;xs:all minOccurs="0"&gt; &lt;xs:element name="mask"&gt; &lt;xs:complexType&gt; &lt;xs:attribute name="filename" type="xs:string" use="required"/&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:all&gt; &lt;xs:attribute name="filename" type="xs:string" use="required"/&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:choice&gt; &lt;xs:assert test="(count(image2D/mask) = 0) or (count(image2D/mask) = count(image2D))"/&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:element&gt; &lt;/xs:schema&gt; </code></pre> <p><strong>If you're using XML Schema 1.0</strong>, you cannot express such a constraint in the schema, but you could use <a href="http://xml.ascc.net/resource/schematron/" rel="nofollow">Schematron</a> or check it at the application level.</p>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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