Segment Modifiers:
X - Distinguishing Identifier Suffix
nn - Segment Iteration (only after first iterartion)
nn - Element Repeat Iteration (only after first iterartion)

GSHDR - GROUP HEADER

GSHDR	GS	Functional Group Header
02		GSHDR_GS02_APP_SNDR_CD	String	Application Senders Code
03		GSHDR_GS03_APP_RCV_CD	String	Application Receivers Code
04		GSHDR_GS04_D8	Date/Time	Date
05		GSHDR_GS05_TM	Time	Time
06		GSHDR_GS06_GCN	Integer	Group Control Number
07		GSHDR_GS07_RESP_AGNCY_CD	String	Responsible Agency Code

STHDR - TRANSACTION SET HEADER

STHDR	ST	Transaction Set Header
02		STHDR_ST02_TCN	String	Transaction Set Control Number
03		STHDR_ST03_IMP_GUID_VERS_NM	String	Implementation Guide Version Name

STHDR	AK1	Functional Group Response
01		STHDR_AK101_FUNC_ID_CD	String	Functional Identifier Code
02		STHDR_AK102_GCN	Integer	Group Control Number
03		STHDR_AK103_VERS_IND_ID_CD	String	Version Release/Industry Identifier Code

L2000 - TRANSACTION SET RESPONSE

L2000	AK2	Transaction Set Response
01		L2000_AK201_VERS	String	Version
02		L2000_AK202_TCN	String	Transaction Set Control Number
03		L2000_AK203_IMP_CONV_REF	String	Implementation Convention Reference

L2100 - ERROR IDENTIFICATION

L2100	IK3	Error Identification
01		L2100_IK301_SEG_ID_CD	String	Segment ID Code
02		L2100_IK302_SEG_POS_IN_TS	Integer	Segment Position in Transaction Set
03		L2100_IK303_LOOP_ID_CD	String	Loop Identifier Code
04		L2100_IK304_IMP_SEG_ERR_CD	String	Implementation Segment Syntax Error Code

L2100	CTX	Segment Context	Iterated: [01-09]
02		L2100_nnCTX02_SEG_ID_CD	String	Segment ID Code
03		L2100_nnCTX03_SEG_POS	Integer	Segment Position in TS
04		L2100_nnCTX04_LOOP_ID_CD	String	Loop ID Code
05	01	L2100_nnCTX0501_ELE_POS_SEG	Integer	Element Position in Segment
05	02	L2100_nnCTX0502_CMP_DT_ELE_POS	Integer	Composite Data Element Position in Composite
05	03	L2100_nnCTX0503_REP_DT_ELE_POS	Integer	Repeating Data Element Position
06		L2100_nnCTX06_REF_IN_SEG	Integer	Reference in Segment

L2100	CTX	Business Unit Identifier
01	01	L2100_CTX0101_CONTXT_NM	String	Context Name
01	02	L2100_CTX0102_CONTXT_REF	String	Context Reference

L2110 - IMPLEMENTATION DATA ELEMENT NOTE

L2110	IK4	Implementation Data Element Note
01	01	L2110_IK40101_ELE_POS_SEG	Integer	Element Position in Segment
01	02	L2110_IK40102_CMP_ELE_POS_COMP	Integer	Component Data Element Position in Composite
01	03	L2110_IK40103_REP_DT_ELE_POS	Integer	Repeating Data Element Position
02		L2110_IK402_DATA_ELE_REF_NR	Integer	Data Element Reference Number
03		L2110_IK403_IMP_DAT_ELE_SYN_CD	String	Implementation Data Element Syntax Error Code
04		L2110_IK404_COPY_BAD_DATA_ELE	String	Copy of Bad Data Element

L2110	CTX	Element Context
02		L2110_CTX02_SEG_ID_CD	String	Segment ID Code
03		L2110_CTX03_SEG_POS_IN_TS	Integer	Segment Position in Transaction Set
04		L2110_CTX04_LOOP_ID_CD	Integer	Loop Identifier Code
05	01	L2110_CTX0501_ELE_POS_SEG	Integer	Element Position in Segment
05	02	L2110_CTX0502_CMP_ELE_POS_COMP	Integer	Component Data Element Position in Composite
05	03	L2110_CTX0503_REP_DT_ELE_POS	Integer	Repeating Data Element Position
06		L2110_CTX06_DATA_ELE_REF_NR	Integer	Data Element Reference Number

L2000	IK5	Transaction Set Response Trailer
01		L2000_IK501_TRANS_STAT	String	Transaction Status
02		L2000_IK502_IMP_TS_ERR_CD	String	Implementation Transaction Set Syntax Error Code
03		L2000_IK503_IMP_TS_ERR_CD	String	Implementation Transaction Set Syntax Error Code
04		L2000_IK504_IMP_TS_ERR_CD	String	Implementation Transaction Set Syntax Error Code
05		L2000_IK505_IMP_TS_ERR_CD	String	Implementation Transaction Set Syntax Error Code
06		L2000_IK506_IMP_TS_ERR_CD	String	Implementation Transaction Set Syntax Error Code

STHDR	AK9	Functional Group Response Trailer
01		STHDR_AK901_FUNC_GRP_ACK_CD	String	Functional Group Acknowledge Code
02		STHDR_AK902_NR_TS_INCLUDED	Integer	Number of Transaction Sets Included
03		STHDR_AK903_NR_REVD_TS	Integer	Number of Received TS
04		STHDR_AK904_NR_ACCPTD_TS	Integer	Number of Accepted TS
05		STHDR_AK905_FUNC_GRP_SYN_ERR	String	Functional Group Syntax Error Code
06		STHDR_AK906_FUNC_GRP_SYN_ERR	String	Functional Group Syntax Error Code
07		STHDR_AK907_FUNC_GRP_SYN_ERR	String	Functional Group Syntax Error Code
08		STHDR_AK908_FUNC_GRP_SYN_ERR	String	Functional Group Syntax Error Code
09		STHDR_AK909_FUNC_GRP_SYN_ERR	String	Functional Group Syntax Error Code

STHDR	SE	Transaction Set Trailer
01		STHDR_SE01_TS_SEG_CT	Integer	Transaction Segment Count
02		STHDR_SE02_TCN	String	Transaction Set Control Number

GSHDR	GE	Functional Group Trailer
01		GSHDR_GE01_NR_TS_INCLUDED	Integer	Number of Transaction Sets Included
02		GSHDR_GE02_GCN	Integer	Group Control Number