When the UAI 1919 phrased the wish for an extensive dictionary of Medieval Latin, it became clear very fast, that the enormous amount of text could not be handled in one single project, as it is the case with classic Latin and the Thesaurus linguae Latinae (TLL).
Still it is the objective, to unite the dictionaries after the national projects are ended. In the meantime, some of them are already concluded and since the twenties of the 20th century, the technical conditions have changed and developed in unimaginable ways, which makes a common platform more likely and more realistic.
Nevertheless, first steps in this direction also have shown the difficulties, such a grand project would encounter. Today it is not any longer about the long project term, but much more about the fact, that all dictionaries differ in their concepts. They need to find a common norm, be accordingly adapted and transferred into collectively searchable databases.
We are confident, that a never before existing linguistic mammoth project of this kind will see the light of this world once all national projects will be concluded.