what is a marc record and why is it important

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1、WhatisaMARCRecordandWhyisitImportant?MARCstandsforMachine-ReadableCataloging.TheMARCformatisawaytoputtheinformationthatusedtobeonacatalogcard,intoalibrary’sonlinecatalog.EverythingthatusedtobeonacatalogcardhasaplaceinaMARCrecord.InorderforMARCrecordstoproperlyfunctioninanonlinecatalog,therem

2、ustbeaconsistencyinthewaytheyarecoded.UniqueinformationappearsatthebeginningtheofMARCrecordLeader:Theleaderisthefirst24charactersoftherecord.Eachspacehasanassignedmeaning,butmostoftheinformationintheleaderisfortheprocessingoftherecord.Directory:Thedirectorytellsthecomputersystemwhichtagsarei

3、ntherecord,theirlength,andstartinglocation.VariableControlFields:Thesefieldsareidentifiedbyataginthedirectorybuthavenoindicatorpositionsorsubfields.TherearetwokindsofVariableControlFields(00X).VariableControlFields:001Controlnumber(usuallysystemgenerated)003Whosesystemcontrolnumberisin001005

4、Dateandtimeoflasttransaction(usuallysystemgenerated)Sixteencharactersthatindicatethedateandtimeofthelatestrecordtransactionandserveasaversionidentifierfortherecord.FixedFieldDataElements:ThefixedfielddataelementsofMARCrecordshavespecificfieldsandvaluesdependingontheformatofthepiecebeingcatal

5、oged.Thefieldmaycontainasingledataelementoraseriesoffixedlengthelements,whichareidentifiedbyposition.Thesefixedlengthfieldsare:006Fixed-LengthDataElements-AdditionalMaterials007PhysicalDescription-FixedFields008Fixed-LengthDataElementsCommonlyUsedMARCFields(VariableDataFields)Thesefieldsvary

6、inlength.TheycontainbibliographicinformationandarethecomponentoftheMARCrecordthatwillinterestlibrarianssincetheycontaintheactualbibliographicinformationthatformerlyappearedoncatalogcards.Thevariablefieldshavecontentdesignatorsconsistingof:Tag-three-digitcodethatidentifiesthekindofdatainthefi

7、eld.Indicator-anumberfrom0-9(orblank),whichimmediatelyfollowsthetagandfurtherdefinesthefield.Eachtag(exceptthe00Xtags)hastwoindicatorpositions.e.g.Afirstindicatorof“1”afterthe245tagspecifiesatitleaddedentry(theproperindicatorwhenanauthorisentered;t