First of all we are holding a conference which is the 12th year of this conference. All english papers of this conference from the 7th year are indexed in IEEE, however for the first 6 years there exist no document identifier over internet. We would like to index this year's conference papers in DBLP in addition to IEEE. I have read this page about the requirements to index proceedings of conferences in DBLP. So there are my questions:
Since there are no permanent identifers for the first 6 years of this conference is it possible to index papers from the 7th year up to now in DBLP or it should be a complete collection of all 12 years of conference?
In the DBLP help page, it's noted that
All contributions should be registered for permanent document identifiers, such as DOI.
May an Arxiv identifier be accepted as a permanent document identifier for indexing in DBLP?
Any answer would be appreciated. Thanks in advance.