I solved this problem using the flatten="true" attribute.
Given this schema
<people>
<person>
<names>
<name>
<firstName>Joe</firstName>
<lastName>Smith</firstName>
</name>
</names>
</person>
</people>
<field column="attr_names" xpath="/people/person/names/name" flatten="true"
/>
attr_names is a multiValued field in my schema.xml. The flatten attribute
tells solr to take all the text from the specified node and below.
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