Dear colleagues, Let me ask a naïve question. What is the purpose of publishing library catalogues as Linked Data? Most often answer I met: the purpose is to make library catalogues accessible to Internet search engines like Google, Yandex, Yahoo, Bing etc. But, first, in fact it could be achieved without RDF and Linked Data as well, and second, there is a doubt that new library namespaces, as they are presented, approach library catalogues to that purpose. Actually for search engines (and browsers) to understand and interpret new terms correctly, strong formal relationships should be established between terms from library namespaces and standard ones, i. e. terms accepted as standard by W3C and main search engine and browser creators. Otherwise library metadata could be understandable only to library-specific software. That draws us back to isolated catalogues. If our purpose is different, that is to include library catalogues into global knowledge system being organized as Linked Data - which seems more appropriate task - in this case we also can not achieve our purpose without establishing relations to standard terms. Unfortunately I could not find such relations in BIBFRAME vocabularies. So what is the purpose of BIBFRAME project, as an instance, from this point of view? I would greatly appreciate if anyone clarify the situation.