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An advanced feature is the use of the XML attribute strategy on a top level metadata field for example Title, Description, Authors, RightsOwner.

We have three four possible values for the attribute

1. KEEP → Don't overwrite the old value for this field if it was not empty

2. OVERWRITE →

   • Overwrite the old value for this field

   • This is the default strategy for simple fields which are fields that contain a textual value such as Title and Description.

3. MERGE →

   • Only allowed for complex fields which are fields that contain sub fields, such as Authors, Keywords and Categories.

   • Merge the new sub fields with the existing sub fields

   • This is the default strategy for complex fields

4. SUBTRACT →

   • Only allowed for complex fields

   • Removes the values from the existing values.

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