public void setStandardIdentifiers(java.util.Collection<String> standardIdentifiers) {
        if (standardIdentifiers == null) {
            this.standardIdentifiers = null;
            return;
        }

        this.standardIdentifiers = new java.util.ArrayList<String>(standardIdentifiers);
    }
<p>
The types of keys that a ProfileObject can have. Each ProfileObject can have only 1 UNIQUE key but multiple
PROFILE keys. PROFILE, ASSET, CASE, or ORDER means that this key can be used to tie an object to a PROFILE,
ASSET, CASE, or ORDER respectively. UNIQUE means that it can be used to uniquely identify an object. If a key a
is marked as SECONDARY, it will be used to search for profiles after all other PROFILE keys have been searched. A
LOOKUP_ONLY key is only used to match a profile but is not persisted to be used for searching of the profile. A
NEW_ONLY key is only used if the profile does not already exist before the object is ingested, otherwise it is
only used for matching objects to profiles.
</p>

@param standardIdentifiers
       The types of keys that a ProfileObject can have. Each ProfileObject can have only 1 UNIQUE key but
       multiple PROFILE keys. PROFILE, ASSET, CASE, or ORDER means that this key can be used to tie an object to
       a PROFILE, ASSET, CASE, or ORDER respectively. UNIQUE means that it can be used to uniquely identify an
       object. If a key a is marked as SECONDARY, it will be used to search for profiles after all other PROFILE
       keys have been searched. A LOOKUP_ONLY key is only used to match a profile but is not persisted to be used
       for searching of the profile. A NEW_ONLY key is only used if the profile does not already exist before the
       object is ingested, otherwise it is only used for matching objects to profiles.
@see StandardIdentifier
aws-java-sdk-customerprofiles/src/main/java/com/amazonaws/services/customerprofiles/model/ObjectTypeKey.java