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The "SchemaXml" page has been changed by PaulLibbrecht.
http://wiki.apache.org/solr/SchemaXml?action=diff&rev1=41&rev2=42

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  === Copy Fields ===
  Any number of `<copyField>` declarations can be included in your schema, to 
instruct Solr that you want it to duplicate any data it sees in the "source" 
field of documents that are added to the index, in the "dest" field of that 
document.  You are responsible for ensuring that the datatypes of the fields 
are compatible. The original text is sent from the "source" field to the "dest" 
field, before any configured analyzers for the originating or destination field 
are invoked.
  
- This is provided as a convenient way to ensure that data is put into several 
fields, without needing to include the data in the update command multiple 
times. The maxChars property may be used in a copyField declaration.   This 
simply limits the number of characters copied.  For example:
+ This is provided as a convenient way to ensure that data is put into several 
fields, without needing to include the data in the update command multiple 
times. The copy is done at the stream source level and no copy feeds into 
another copy. The maxChars property may be used in a copyField declaration.   
This simply limits the number of characters copied.  For example:
  
  {{{
   <copyField source="body" dest="teaser" maxChars="300"/>

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