myCollections = new ArrayList<Metadata>(dsFirst.getAllMetadataByType(coltype));
if (myCollections != null && myCollections.size() > 0) {
for (Metadata md : myCollections) {
// Metadata md = (Metadata) it.next();
if (myKollektionenTitel.contains(md.getValue())) {
dsFirst.removeMetadata(md);
} else {
myKollektionenTitel.add(md.getValue());
}
}
}