can i have more update processors with solr

[Dilshod Temirkhodjaev]

I don't know if this is bug or not, but when i'm writing this in
solrconfig.xml

<requestHandler name="/update" class="solr.XmlUpdateRequestHandler">
  <lst name="defaults">
    <str name="update.processor">CustomRank</str>
    <str name="update.processor">dedupe</str>
  </lst>
</requestHandler>

only first update.processor works, why second is not working?