title: Jackson XML Deserialization - Save an Unrecognized Field
body: <p>I am using Jackson to deserialize an XML file returned by a server. I'm getting an UnrecognizedPropertyException with the error message "Unrecognized field "" ".</p>
  
  <p>The XML in question:</p>
  
  <pre><code>&lt;Identifiers&gt;
      &lt;Identifier type="Organisational Study"&gt;Q2736g&lt;/Identifier&gt;
      &lt;Identifier type="NCT"&gt;NCT00109200&lt;/Identifier&gt;
  &lt;/Identifiers&gt;
  </code></pre>
  
  <p>Stack Trace:</p>
  
  <pre><code>com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "" (class sloan.scraper.Trial$Identifier), not marked as ignorable (3 known properties: , "data2", "type", "data"])
   at [Source: java.io.StringReader@28c2f254; line: 1, column: 547] (through reference chain: sloan.mit.cortellisScraper.Trial["Identifiers"]-&gt;sloan.mit.cortellisScraper.Identifier[""])
      at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:79)
      at com.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:579)
      at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:672)
      at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:906)
      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:328)
      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
      at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:147)
      at com.fasterxml.jackson.databind.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:18)
      at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
      at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:107)
      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:308)
      at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
      at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2796)
      at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1942)
      at sloan.mit.cortellisScraper.Main.fetchJson(Main.java:173)
      at sloan.mit.cortellisScraper.Main.main(Main.java:64)
  </code></pre>
  
  <p>How can I use Jackson to save the unrecognized field?</p>