</code>.
For example, in the XML archive, the override for this type renders an object_id equal to 23 as
"object_id=_23".  The following table lists the types defined in the 
<code style="white-space: normal">boost::archive namespace</code>
used internally by the serialization library:
<p>
<table border>
<tr><th align=left>type</th><th align=left><code style="white-space: normal">default<br>serialized as</code></th>
<tr><td><code style="white-space: normal">version_type</code></td><td><code style="white-spa