property attributes in jcrmapping versus property attributes in custom_nodetypes.xml ?

[ruchi goel]

Hi,
  I am writing a jcrMapping.xml  which will map my java classes to 
custom node types.
My custom_nodetypes.xml already has nodetype with properties which have 
attributes
requiredType="String" autoCreated="false" mandatory="true" 
onParentVersion="COPY" protected="false" multiple="true" />

Then why do I need to add  similar attributes in jcrmapping for each 
property.* Refer in following extract :*


  
 *  <!ATTLIST field-descriptor
   fieldName CDATA #REQUIRED
   fieldType CDATA #IMPLIED
   jcrName CDATA #IMPLIED
   id (true | false) "false"
   path (true | false) "false"
       jcrType (String | Date | Long | Double | Boolean | Binary) #IMPLIED
       jcrAutoCreated (true | false) "false"
       jcrMandatory (true | false) "false"
       jcrOnParentVersion (COPY | VERSION | INITIALIZE | COMPUTE | 
IGNORE | ABORT) "COPY"
       jcrProtected (true | false) "false"
       jcrMultiple (true | false) "false"
>
*
Which one takes the priority ? The one in jcrmapping.xml or the one in 
custom_nodetypes.xml

Thanks,
Ruchi