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    <p>Some more informations (code, expected XML etc.) would be helpful ...</p> <p>But here's an example how you can do this:</p> <p>The key feature is implementing a <a href="http://simple.sourceforge.net/download/stream/doc/javadoc/org/simpleframework/xml/convert/Converter.html" rel="nofollow noreferrer"><code>Converter</code></a>, where you can customize how objects are serialized / deserialized. In the following code I implement a <code>Converter</code> for the <code>Child</code> class, however it's possible to implement it for the <code>Parent</code> class instead too.</p> <h3>The <code>Child</code> class:</h3> <pre><code>@Root(name = "child") @Convert(value = ChildConverter.class) // Set the Converter public class Child { private boolean actived; @Element(name = "value", required = true) private String value; @Element(name = "value2", required = true) private int secondValue; public Child(boolean actived, String value, int secondValue) { this.actived = actived; this.value = value; this.secondValue = secondValue; } public boolean isActived() { return actived; } public String getValue() { return value; } public int getSecondValue() { return secondValue; } // ... } </code></pre> <p>Beside the <code>activated</code> flag this class has two other members to show how do serialize them.</p> <h3>The <code>Parent</code> class:</h3> <pre><code>@Root(name = "parent") public class Parent { @ElementList(name = "childs", required = true) private List&lt;Child&gt; childs; public Parent() { this.childs = new ArrayList&lt;&gt;(); } public void addChild(Child child) { childs.add(child); } // ... } </code></pre> <h3>The <code>Converter</code> implementation:</h3> <pre><code>public class ChildConverter implements Converter&lt;Child&gt; { @Override public Child read(InputNode node) throws Exception { throw new UnsupportedOperationException("Not supported yet."); } @Override public void write(OutputNode node, Child value) throws Exception { if( value.isActived() == true ) // Check if 'activated' flag is set { // Set valus of the child node.setValue(value.getValue()); node.setAttribute("secondValue", String.valueOf(value.getSecondValue())); } else { node.remove(); // Remove the node since we don't need it } } } </code></pre> <p>The implementation is not very complex so far. First we check if <code>activated</code> is set. If yes we fill the objects value into the node, if it's not set we remove the node (else you'll get a <code>&lt;child /&gt;</code> in your XML).</p> <h3>How to use:</h3> <pre><code>// Some test data Parent p = new Parent(); p.addChild(new Child(true, "a", 1)); p.addChild(new Child(true, "b", 2)); p.addChild(new Child(false, "c", 3)); // "disabled" p.addChild(new Child(true, "d", 4)); p.addChild(new Child(false, "e", 5)); // "disabled" p.addChild(new Child(false, "f", 6)); // "disabled" final File f = new File("test.xml"); Serializer ser = new Persister(new AnnotationStrategy()); // Don't forget 'AnnotationStrategy'! ser.write(p, f); // Serialize to a file or whatever you need </code></pre> <p>And finally ...</p> <h3>The XML output:</h3> <pre class="lang-xml prettyprint-override"><code>&lt;parent&gt; &lt;childs class="java.util.ArrayList"&gt; &lt;child secondValue="1"&gt;a&lt;/child&gt; &lt;child secondValue="2"&gt;b&lt;/child&gt; &lt;child secondValue="4"&gt;d&lt;/child&gt; &lt;/childs&gt; &lt;/parent&gt; </code></pre> <p>There are only <code>child</code> elements for object where <code>activated</code> was <code>true</code>, those with <code>false</code> are skipped.</p> <p><strong><em>Note:</strong> If you want to remove <code>class="java.util.ArrayList"</code> please see here: <a href="https://stackoverflow.com/questions/12113025/remove-class-attribute/12145092#12145092">Remove class= attribute</a></em></p>
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    1. COThanks for your response, and sorry for the lack of code example in my question. But it seems you grasped the problem anyway :). I will test this solution in a few hour but I think that is the right answer.
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    2. COFeel free to post any problems ;-)
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    3. COOkay, it's working like a charm, but I have an additional question : In the write method, do I have a way to serialize the Child instance to a node using the annotations put on it ? Because, if I understand correctly, the two Element annotation on the value and secondValue fields of the Child class are note used.
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