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In config/spring/api/identifier-service.xml you will see some other configuration of the EZIDIdentiferProvider bean.  You may not need to change any of it.  But here you can alter the mapping between DSpace and EZID metadata, should you choose.  The crosswalk property is a map from DSpace metadata fields to EZID fields, and can be extended or changed.  The key of each entry is the name of an EZID metadata field; the value is the name of the corresponding DSpace field, from which the EZID metadata will be populated.

You can also supply a transformation transformations to be applied to a field values using the crosswalkTransform property.  Each key is the name of an EZID metadata field, and its value is the name of a Java class which will convert the value of the corresponding DSpace field to its EZID form.  The only transformation currently provided is one which converts a date to the year of that date, named org.dspace.identifier.ezid.DateToYear.  In the configuration as delivered, it is used to convert the date of issue to the year of publication.  You may create new Java classes with which to supply other transformations, and map them to metadata fields here.  If an EZID metadatum is not named in this map, the default mapping is applied:  the string value of the DSpace field is copied verbatim.

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