ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...

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ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationANSI X3.4-1986. The text or character data in Type-2, Type-9, and records arenormally recorded using the 7-bit ASCII code in variable-length fields withspecified upper limits on the size of the fields. For data interchange betweennon-English speaking agencies, character sets other than 7-bit ASCII may beused in metadata. UTF-8 is the preferred method of storing textual data thatcannot be represented as 7-bit ASCII. This method supports internationalcharacter sets for all user-defined fields in all record types. By definition UTF-8and other international character exchange methods are not applicable to RecordType-1 in all encodings.7 Record type descriptions 97.1 Type-1 Transaction information recordTransmissions to be exchanged are required to contain one and only one Type-1record per transaction. A Type-1 record is mandatory and is required for eachtransaction. The Type-1 record shall always be the first record within thetransaction. Depending on the usage and the number of fingerprint, palmprint,facial, SMT, DNA, plantar, iris, or other biometric information records available forprocessing, one or more additional records shall be present in the file. The Type-1 record shall provide information describing type and use or purpose for thetransaction involved, a listing of each record included in the transaction, theoriginator or source of the physical record, and other useful and requiredinformation items. There is only one Type-1 record in each transaction.7.1.1 Implementation Domain (DOM)Brad Wing 6/19/10 5:07 PMComment: ClarificationAn implementation domain 10 , codified as Domain Name (DOM) in a Type-1record, is a group of agencies or organizations that have agreed to use preassigneddata fields with specific meanings (typically in Record Type-2) forexchanging information unique to their installations.An example of an implementation domain is the one maintained by the CriminalJustice Information Services (CJIS) Division of the Federal Bureau ofInvestigation (FBI). It is the North American Domain subscribed to by the RoyalCanadian Mounted Police (RCMP), the FBI, and several state and Federalagencies in North America.Brad Wing 6/19/10 5:07 PMComment: Revised wording•9 Throughout this standard the terminology Record Type or record is used. It does not imply a separate file.•10 The “implementation domain” is not to be confused with the “Biometrics domain.” The Biometrics domain is anamespace used in NIEM-conformant implementations of this standard.14DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationA change from earlier version of this standard is to make Domain Name (DOM) amandatory field for all new implementations. Developers should be aware thathistorical implementations may not contain the DOM field 11 .7.1.2 Image designation character (IDC)With the exception of the Type-1 record, each of the remaining records present ina transaction shall include a separate field containing the Image designationcharacter (IDC). IDC references are established in Type-1 Field File Content(CNT). The IDC shall be used to relate information items in the CNT field of theType-1 record to the other records in the transaction, and to properly identify andlink together records that pertain to the same entity such as a particular finger orface. Thus, each instance of a record type, other than the Type-1 record, shallcontain an IDC field. The value of the IDC shall be a sequentially assigned apositive integer starting from zero and incremented by one. If two or morerecords that are different representations of the same subject matter are presentin a transaction, each of those records shall contain the same IDC. For example,a Type-14 image record of a specific fingerprint and the corresponding Type-9minutiae record for the same finger would carry the same IDC number. Eachrecord (including multiple occurrences of a Type) following Type-1 contains anIDC reference.Note that the IDC serves a different purpose than the Original Image Record(OIV) value. (See Section 7.15.1) The OIV does not appear in Record Type-1.Although there is no upper limit on the number of records that may be present ina file, generally a minimum of two will be present in a file. For example, atenprint search inquiry transaction may consist of a Type-1 record, a Type-2record, 14 Type-14 grayscale image records, two Type-8 signature records, sixType-15 palmprint records, and a Type-10 facial/mugshot image of the subject.Additional mugshot, SMT, iris, or other biometric records may expand the fileeven more. For this file configuration, the IDC shall range from "0" to “Maxnumber of records minus one” which would include an IDC code for the Type-2record. Within the same file, multiple record types may be present and representthe same image. For example, if core and delta location information for the rolledimpressions is requested, the transmission may also need to accommodate tenminutiae records within the same file. For each image representing the ten fingerpositions, the same IDC would be used in both the image and minutiae records.7.2 Type-2 User-defined descriptive text recordType-2 records shall contain user-defined textual fields providing identificationand descriptive information associated with the subject of the transaction. EachBrad Wing 6/19/10 5:07 PMComment: Note reference to the website nowin the footnoteBrad Wing 6/19/10 5:07 PMComment: Wording changeBrad Wing 6/19/10 5:07 PMComment: Revised wording to reflect Type-14specifically.Brad Wing 6/19/10 5:07 PMComment: New textBrad Wing 6/19/10 5:07 PMComment: Wording change11Note that there is no formal central registry of implementation domains.•15DRAFT 2
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