Amanda � let me preface this by saying that you�re free to use any prefix you want when creating BIBFRAME RDF, as long as you bind it to the proper namespace. You could use bf:, bf2:, or xyz: Having said that, the preferred prefix for BIBFRAME 2 is �bf:� . We discourage the use of bf2:, but you�re free to use it if you choose. To distinguish BIBFRAME 2 from BIBFRAME 1, we suggest using the prefix bf1: for BIBFRAME 1, but again, you�re free to use bf:, as long as you bind it to the BIBFRAME 1 namespace. An OWL ontology can declare a preferred prefix (via axiom preferredPrefix I think), which is non-binding of course. You mention �variations� of BIBFRAME � each is free to declare whatever preferred prefix they like, including �bf:�. There is no reason to - and in fact one should not � try to differentiate vocabularies by assigning unique prefixes. Namepace URIs are unique, prefixes need not be. Ray From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Xu, Amanda Sent: Thursday, May 26, 2016 4:07 PM To: [log in to unmask] Subject: Re: [BIBFRAME] bf:mainTitle Hi Thanks a lot for the explanation! There are several variations of BIBFRAME vocabulary, e.g. http://bibframe.org/vocab/, http://bibfra.me/vocab/lite/, http://bibframe.org/vocab2/, etc. Shall we differentiate them by using prefix {bf:} for http://bibframe.org/vocab/, prefix {bf2:} for http://bibframe.org/vocab2/, etc.? If so, the example for bf:mainTitle will become bf2:mainTitle. How do you think? Thanks! Amanda From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Denenberg, Ray Sent: Thursday, May 26, 2016 11:26 AM To: [log in to unmask]<mailto:[log in to unmask]> Subject: Re: [BIBFRAME] bf:mainTitle Joe, consider the following excerpt from a MODS record: <titleInfo> <title>Private Eyeballs</title> <subTitle>a golden treasury of bad taste</subTitle> </titleInfo> �. and note that <title> in MODS corresponds to BIBFRAME mainTitle so you could look at this as: <titleInfo> <mainTitle>Private Eyeballs</mainTitle> <subTitle>a golden treasury of bad taste</subTitle> </titleInfo> (Even though there is no <mainTitle> element in MODS, pretend there is.) So if you want to make this into a BIBFRAME title, the lazy way to do it might be to construct a title string from the main and sub title: bf:title [rdfs:label �Private Eyeballs - a golden treasury of bad taste�] Or, you could parse out the main and sub titles: bf:title [ bf:mainTitle "Private Eyeballs" ; bf:subtitle "golden treasury of bad taste" ] . Or you could provide both the title string as well as the parsed title: bf:title [ rdfs:label �Private Eyeballs - a golden treasury of bad taste� ; bf:mainTitle "Private Eyeballs" ; bf:subtitle "golden treasury of bad taste" ] . Let�s take another example. In this MODS record, only the main title is expressed: <titleInfo> <title>Reflexive interpreters and autobiographical texts</title> </titleInfo> So the mainTitle is �Reflexive interpreters and autobiographical texts�. You could express this in BIBFRAME as the mainTitle, but only if you use that string verbatim. You could express the string: �Reflexive interpreters and autobiographical texts � English � 1977� But in this case you would express it as a label, not as the mainTitle because it is not the main title. Hope that helps. Ray From: Bibliographic Framework Transition Initiative Forum [mailto:[log in to unmask]] On Behalf Of Joseph Kiegel Sent: Thursday, May 26, 2016 11:34 AM To: [log in to unmask]<mailto:[log in to unmask]> Subject: [BIBFRAME] bf:mainTitle It would be helpful to have more information on the use of bf:mainTitle as opposed to rdfs:label. The Titles specification (https://www.loc.gov/bibframe/docs/pdf/bf2-titles-apr2016.pdf) uses both in the examples. Specifically, examples 2-5 use bf:mainTitle to hold the title string. It seems that examples 1 and 6 could as well. The definition of bf:mainTitle is quite broad: �Title being addressed. Possible title component�. Alternate Example 1: bf:title [ a bf:Title , bf:WorkTitle ; bf:mainTitle "Reflexive interpreters and autobiographical texts" ] . Alternate Example 6: bf:title [ a bf:Title , bf: VariantTitle ; bf:mainTitle �Chartbook on aging� ; bf:variantType �spine � ] . What are the criteria for using bf:mainTitle vs. rdfs:label?