Hi Helix, the URN should be in the following format
urn:nbn:de:[library network]*:[library seal]-[unique production number][check digit] Example urn:nbn:de:bvb:m333:sab-089-3321752945 Now let me explain the different parts of it. urn:nbn:de is fix and given by the national library bvb is the identification number of the greater institution m333 is the seal of our "library" actually we are a archive sab is free chosen and stands for our library name 089-332175294 is the "filename" or resource name 5 is the calculated check digit OK now you want to know how the check digit is generated, do you? The string 089-332175294 will be converted to a string by replacing every sign with the one given in the following table 0=1 J=25 1=2 K=42 2=3 L=26 3=4 M=27 4=5 N=13 5=6 O=28 6=7 P=29 7=8 Q=31 8=9 R=12 9=41 S=32 A=18 T=33 B=14 U=11 C=19 V=34 D=15 W=35 E=16 X=36 F=21 Y=37 G=22 Z=38 H=23 +=49 I=24 :=17 _=43 -=39 .=47 /=45 After converting you get this 1112131713141317151617221434171941394432863415 Now every sign is multiplied, the first sign with 1, the second with 2, the third with 3 and so on... for every sign you had multiplied you increase the multiplier with 1 So the calculation looks like this Sum = 1*1 + 2*1 + 3*1 + 4*2 + 5*1 + 6*3 ... n*m sum = 4027 now you take the last number (5) of the converted sting above (1112131713141317151617221434171941394432863415) and divide the Sum by 5 so you get the quotient quotient = sum / lastnumber quotient = 4017 / 5 quotient = 805,4 Now the check digit is the number before the comma in check digit = 5 The result is the URN + check digit urn:nbn:de:bvb:m333:sab-089-3321752945 Do you think we get this working without a patch? Hope i have explained all right, the informations taken from http://www.persistent-identifier.de/?link=316 And you wrote that @mire planing to integrate such a feature in 4.0, hm i think thats to much time to waiting for. Thank you for you information in the second mail about the discussion. Anette was asking this in 2003 but i saw that she is located in germany too and i got her contacts from her website and maybe she can tell me if they had implemented it in such a way.... Thanks a lot Helix Marco Zitat von helix84 <[email protected]>: > On Mon, Oct 29, 2012 at 4:51 PM, <[email protected]> wrote: >> is it possible to generate URN with DSpace? If not, is it planed to >> implement this in the next releases? In 3.0 ;-) ? > > Hi Marco, > > how exactly are these URNs generated? Maybe you can do it without any patch. > > Regarding the planned External Identifier Services feature by @mire, > this is one that they didn't yet have ready for 3.0, so 4.0 would be > my guess. > > > Regards, > ~~helix84 > > Compulsory reading: DSpace Mailing List Etiquette > https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ DSpace-tech mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dspace-tech
