public Mapping withChildren(java.util.Collection<Mapping> children) {
        setChildren(children);
        return this;
    }
<p>
Only applicable to nested data structures. If you want to change the parent structure, but also one of its
children, you can fill out this data strucutre. It is also <code>Mapping</code>, but its <code>FromPath</code>
will be the parent's <code>FromPath</code> plus the <code>FromPath</code> from this structure.
</p>
<p>
For the children part, suppose you have the structure:
</p>
<p>
<code>{ "FromPath": "OuterStructure", "ToKey": "OuterStructure", "ToType": "Struct", "Dropped": false, "Chidlren": [{ "FromPath": "inner", "ToKey": "inner", "ToType": "Double", "Dropped": false, }] }</code>
</p>
<p>
You can specify a <code>Mapping</code> that looks like:
</p>
<p>
<code>{ "FromPath": "OuterStructure", "ToKey": "OuterStructure", "ToType": "Struct", "Dropped": false, "Chidlren": [{ "FromPath": "inner", "ToKey": "inner", "ToType": "Double", "Dropped": false, }] }</code>
</p>

@param children
       Only applicable to nested data structures. If you want to change the parent structure, but also one of its
       children, you can fill out this data strucutre. It is also <code>Mapping</code>, but its
       <code>FromPath</code> will be the parent's <code>FromPath</code> plus the <code>FromPath</code> from this
       structure.</p>
       <p>
       For the children part, suppose you have the structure:
       </p>
       <p>
       <code>{ "FromPath": "OuterStructure", "ToKey": "OuterStructure", "ToType": "Struct", "Dropped": false, "Chidlren": [{ "FromPath": "inner", "ToKey": "inner", "ToType": "Double", "Dropped": false, }] }</code>
       </p>
       <p>
       You can specify a <code>Mapping</code> that looks like:
       </p>
       <p>
       <code>{ "FromPath": "OuterStructure", "ToKey": "OuterStructure", "ToType": "Struct", "Dropped": false, "Chidlren": [{ "FromPath": "inner", "ToKey": "inner", "ToType": "Double", "Dropped": false, }] }</code>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-glue/src/main/java/com/amazonaws/services/glue/model/Mapping.java