lucene/example/multicore/core0/conf/schema.xml

<?xml version="1.0" ?>
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<schema name="example core zero" version="1.1">
  <types>
   <fieldtype name="string"  class="solr.StrField" sortMissingLast="true" omitNorms="true"/>
  </types>

 <fields>   
  <!-- general -->
  <field name="id"      type="string"   indexed="true"  stored="true"  multiValued="false" required="true"/>
  <field name="type"    type="string"   indexed="true"  stored="true"  multiValued="false" /> 
  <field name="name"    type="string"   indexed="true"  stored="true"  multiValued="false" /> 
  <field name="core0"   type="string"   indexed="true"  stored="true"  multiValued="false" /> 
 </fields>

 <!-- field to use to determine and enforce document uniqueness. -->
 <uniqueKey>id</uniqueKey>

 <!-- field for the QueryParser to use when an explicit fieldname is absent -->
 <defaultSearchField>name</defaultSearchField>

 <!-- SolrQueryParser configuration: defaultOperator="AND|OR" -->
 <solrQueryParser defaultOperator="OR"/>
</schema>