<!-- missing name attribute in first event -->
<trace>
<event timestamp="1" source="1">
<field name="b" value="1" type="int" />
<field name="d" value="3" type="int" />
</event>
<event timestamp="3" name="B" source="2">
<field name="f" value="c" type="string" />
<field name="g" value="e" type="string" />
</event>
<event timestamp="4" name="A" source="1">
<field name="b" value="3" type="int" />
<field name="d" value="7" type="int" />
</event>
<event timestamp="5" name="B" source="2">
<field name="f" value="c" type="string" />
<field name="g" value="e" type="string" />
</event>
</trace>