mt2503 vCard 2.1 和 vCard 3.0有何不同？

Differencebetweenvcard2.1andvcard3.0ismainlyfROMvcard2.1andvcard3.0profile,fromMMIview,wecannotseethedifference.Inversion3.0theyha
veintroducedsomenewfields.
Asfarasiknowfollowingisthelistofpropertiesusedinversion2.1and3.0.
Accordingtothisinversion3.0,theyhaveintroducedsomenewfieldsandremovedsomefunctionalaties(ex:EncodingNOTEfieldhasbeenremoved)
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version2.1
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FN,N,PHOTO,BDAY,ADR,LABEL,TEL,EMAIL,MAILER,TZ,GEO,TITLE,ROLE,
Logo,Agent,ORG
NOTE,REV,SOUND,URL,UID,Version,KEY
==========================
Version3.0
==========================
FN,N,NICKNAME,PHOTO,BDAY,ADR,LABEL,TEL,EMAIL,MAILER,TZ,GEO,
TITLE,ROLE
LOGO,AGENT,ORG,CATEGORIES,NOTE,PRODID,REV,SORTSTRING,SOUND,UID,
URL,VERSION,CLASS,KEY
SothefollowingfieldsarenewtoVersion3.0
NICKNAME
CATEGORIES
PRODID
SORTSTRING
CLASS