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The syntax of the .nsc file is defined by using augmented BNF (ABNF) grammar [RFC4234] as follows:
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nscfile = "[Address]" CRLF address-section "[Formats]" CRLF formats-section address-section = optional-properties1 ip-address ip-port optional-properties2 ip-address = "IP Address" string-param ip-port = "IP Port" integer-param formats-section = 1*( format [ description ] ) format = "Format" 1*DIGIT *WSP "=" *WSP binary CRLF description = "Description" 1*DIGIT string-param optional-properties1 = [ name-prop ] [ version ] [ mcadapter ] name-prop = "Name" string-param version = "NSC Format Version" *WSP "=" *WSP "3.0" CRLF mcadapter = "Multicast Adapter" string-param optional-properties2 = [ ttl ] [ ecc ] [ logurl ] [ rollover ] [ split ] [ cache ] [ expire ] [ nbt ] ttl = "Time To Live" integer-param ecc = "Default Ecc" integer-param logurl = "Log URL" string-param rollover = "Unicast URL" string-param split = "Allow Splitting" integer-param cache = "Allow Caching" integer-param expire = "Cache Expiration Time" integer-param nbt = "Network Buffer Time" integer-param string-param = *WSP "=" *WSP string CRLF integer-param = *WSP "=" *WSP integer CRLF integer = "0x" 8HEXDIG string = ( *VCHAR ) / binary binary = "02" encoded-block encoded-block = 12*encoded-char encoded-char = ALPHA / DIGIT / "{" / "}"
Additional rules for the "string" syntax element are as specified in section 2.2.1.2.
Additional rules for the "encoded-block" syntax element are as specified in section 2.2.1.3.