Ниже примеры исходных файлов и XML:
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AIR-BLK205;7A;;221;2400011889;9E11773364;001001
AMD 2400000495              
9E11773364;9E11773364
MUC1A YIQ9H2024;0101;MOWRU25GH;92220306;MOWRU25GH;92220306;MOWRU25GH;92220306;;;;;;;;;;;;;;;;;;;;;BA ATGI6R;OS HF55M 
A-AUSTRIAN AIRLINES;OS 2575
B-TTP/BTK
C-7906/ VLSU-VLSU-I-0
D-030123;030124;030124
G-X  ;SOTO;LONIEV;E1
H-012;005OLHR;LONDON LHR       ;VIE;VIENNA SCHWECHAT ;OS    0458 C C 29JAN0635 0945 29JAN;OK01;B ;0;320;;;30K;2 ;;ET;0210 ;N;800
H-005;006XVIE;VIENNA SCHWECHAT ;KBP;KIEV BORISPOL    ;OS    0661 C C 29JAN1035 1330 29JAN;OK01;S ;0;321;;;30K;;0950 ;;0155 ;N;667
U-014;002MIS 1A OK01 24JAN;SVO;MOSCOW;TAXI CONFM/ZZ;
U-010;003OSVO;MOSCOW SVO       ;LHR;LONDON LHR       ;BA    0875 B B 26JAN2040 2200 26JAN;OK01;M ;0;767;;;;2 ;;ET;0420 ;N;;1570;
U-011;004HHL SR OK01 26JAN;29JAN;LON;LONDON;1C1SBTI;;GBPRUB;148.00+26JAN+03+7576.63;;;;;;;;;;;DLY;RTT-;MYH;BC-YC1SBTI;BS-92220306;CF-13499786;AP-;CD-;CR-;DP-;EX-;FA-;FM-;G-CCVI4154810113241119EXP0804;ID-;MA-;RA-;RC-;RO-;SI-;SF-;**-;MYHOTEL BLOOMSBURY;11-13 BAYLEY STREET;BEDFORD SQUARE;LONDON;;UNITED KINGDOM;WC1B3HD;44 207 6676000;44 207 6676044;NONE;+;COM-8.0   PERCENT;;DES-CONSORTIA RATE 01JAN03 - 31DEC03;RATE IS SUBJECT TO 17,5 PCT TAX. SERVICE CHAR;GUESTS ENJOY 24HR USE OF MYLIBRARY, AN OASIS ;;;TAX-;;SVC-;;MEA-;;STA-;HLD-;CXL-CANCELLATION MUST BE RECEIVED 01 DAYS;PRIOR TO ARRIVAL LOCAL TIME TO AVOID PENALTY;;;;;ADV-;TTL-GBP444.00;;NGT-03;;VV-;RUB22729.89;BN-;;;;;RRO-;MOW 7 095 721 21 10 - BTI RUSSIA - AGENT VL;;P1
U-013;007MIS 1A OK01 29JUL;SVO;MOSCOW;ZZ;
K-FGBP1035.00    ;USD1665.00    ;;;;;;;;;;;USD1774.68    ;1.60901    ;;   
KFTF; USD64.36    GB AD; USD13.52    UB AS; USD8.00     YQ VO; USD11.14    ZY AE; USD8.00     YQ AS; USD4.66     AT SE;;;;;;;;;;;;;;;;;;;;;;;;
L-
M-COW            ;COW            
N-NUC;1628.05
O-XXXX;XXXX
Q-LON OS X/VIE OS IEV M1628.05NUC1628.05END ROE0.635729
I-001;01CHOULGA/DMITRY MR;;APMOW 7 095 721 21 10 - BTI RUSSIA - AGENT VL;;
T-O257-4407768663
FM*M*7;S5-6;P1
FPINV;S5-6;P1
FVOS;S5-6;P1
TKOK24JAN/MOWRU25GH
END
AIR-BLK205;7A;;221;2400011893;9E11773364;001001
AMD 2400000496              
9E11773364;9E11773364
MUC1A YIQ9H2024;0101;MOWRU25GH;92220306;MOWRU25GH;92220306;MOWRU25GH;92220306;;;;;;;;;;;;;;;;;;;;;BA ATGI6R;OS HF55M 
A-BRITISH AIRWAYS;BA 1256
B-TTP/BTK
C-7906/ VLSU-VLSU-M-1
D-030123;030124;030124
G-X  ;SITI;MOWLON;E1
H-010;003OSVO;MOSCOW SVO       ;LHR;LONDON LHR       ;BA    0875 B B 26JAN2040 2200 26JAN;OK01;M ;0;767;;;23K;2 ;;ET;0420 ;N;1570
U-014;002MIS 1A OK01 24JAN;SVO;MOSCOW;TAXI CONFM/ZZ;
U-011;004HHL SR OK01 26JAN;29JAN;LON;LONDON;1C1SBTI;;GBPRUB;148.00+26JAN+03+7576.63;;;;;;;;;;;DLY;RTT-;MYH;BC-YC1SBTI;BS-92220306;CF-13499786;AP-;CD-;CR-;DP-;EX-;FA-;FM-;G-CCVI4154810113241119EXP0804;ID-;MA-;RA-;RC-;RO-;SI-;SF-;**-;MYHOTEL BLOOMSBURY;11-13 BAYLEY STREET;BEDFORD SQUARE;LONDON;;UNITED KINGDOM;WC1B3HD;44 207 6676000;44 207 6676044;NONE;+;COM-8.0   PERCENT;;DES-CONSORTIA RATE 01JAN03 - 31DEC03;RATE IS SUBJECT TO 17,5 PCT TAX. SERVICE CHAR;GUESTS ENJOY 24HR USE OF MYLIBRARY, AN OASIS ;;;TAX-;;SVC-;;MEA-;;STA-;HLD-;CXL-CANCELLATION MUST BE RECEIVED 01 DAYS;PRIOR TO ARRIVAL LOCAL TIME TO AVOID PENALTY;;;;;ADV-;TTL-GBP444.00;;NGT-03;;VV-;RUB22729.89;BN-;;;;;RRO-;MOW 7 095 721 21 10 - BTI RUSSIA - AGENT VL;;P1
U-012;005OLHR;LONDON LHR       ;VIE;VIENNA SCHWECHAT ;OS    0458 C C 29JAN0635 0945 29JAN;OK01;B ;0;320;;;;2 ;;ET;0210 ;N;;800;
U-005;006OVIE;VIENNA SCHWECHAT ;KBP;KIEV BORISPOL    ;OS    0661 C C 29JAN1035 1330 29JAN;OK01;S ;0;321;;;;;0950 ;;0155 ;N;;667;
U-013;007MIS 1A OK01 29JUL;SVO;MOSCOW;ZZ;
K-FUSD450.00     ;;;;;;;;;;;;USD465.50     ;32.50      ;;   
KFTF; USD9.50     RI DP; USD2.00     UH SE; USD4.00     YQ VO;;;;;;;;;;;;;;;;;;;;;;;;;;;
L-
M-BEUCBAOW       
N-NUC450.00
O-XXXX
Q-MOW BA LON450.00NUC450.00END ROE1.000000
I-001;01CHOULGA/DMITRY MR;;APMOW 7 095 721 21 10 - BTI RUSSIA - AGENT VL;;
T-O125-4424413601
FENONREF/-EUCBA3N;S3;P1
FM*M*7;S3;P1
FPINV;S3;P1
FVBA;S3;P1
TKOK24JAN/MOWRU25GH
ENDX
---------------------------------------------------------
<?xml version="1.0" encoding="Windows-1251"?>
<AIR2057A>
<TKT Number="4424413601" Srl="125" AirLine="BA" Traveller="CHOULGA/DMITRY MR" CalcCry="USD" CalcTariff="450" PayTariff="450" PayTaxSum="15.5" ROE="32.5" SvcType="AIR" CRSType="1A" BookRef="Q9H202" BookDate="23.01.03" FullFare="465.5" OrgnRate="1.000000" CmssPcnt="7">
<Segments>
<SGT SegNo="1" StopOver="O" DprtAirPort="SVO" DprtName="MOSCOW SVO" ArrvAirPort="LHR" ArrvName="LONDON LHR" IsVoid="False" Carrier="BA" Flight="0875" DprtTime="20:40:00" DprtDate="26.01.03" Class="B" ArrvTime="22:00:00" ArrvDate="26.01.03" Seat="OK" Meal="M" AirCraft="767" WeightCode="23K" DprTrmnl="2" Duration="0420"/>
</Segments>
<Fares>
<FARE Code="MOW BA LON" Amount="450" CryCode="NUC"/>
</Fares>
<Taxes>
<TAX Amount="9.5" CryCode="USD" Code="RI DP"/>
<TAX Amount="2" CryCode="USD" Code="UH SE"/>
<TAX Amount="4" CryCode="USD" Code="YQ VO"/>
</Taxes>
</TKT>
</AIR2057A>

--------------------------------------------------------------------------------------
Запись создана 13.03.2007 в 17:58:47
МОВ                                                   МОВМОВ
ИЖВИЖ   4550РУБ                                       45Х1Ш8/ГРС
МОВИЖ   4550РУБПС1202296004             13МАР07             20МОЮ ТКП
---            КОСТИНА/НАТАЛИЯ Г-ЖА                         ООО"МАВИНС"
                                                            МОСКВА РФ
                                                            00115360     0172


               МОСКВА         ДМД  ИЖ 3302 Э 19  0955 17 Э                  20К
                                             МАР       Г
               ИЖЕВСК              ИЖ 3301 Э 21  0800 18 Э                  20К
                                             МАР       А
               МОСКВА         ДМД

                                                      ОАО ИЖАВИА
    9100РУБ    НАЛ
9100РУБ
                                   И160РУБ
9260РУБ                                                23A  ›Е6179022724
9260.00РУБ СБОРЫ ПР=0.00РУБ БР=0.00РУБ
НЕ ЗАБУДЬТЕ ЗАВЕРШИТЬ ДИАЛОГ ИЛИ ПЕЧАТЬ КВИТАНЦИИ
---------------------------------------------------------------------------------------



<?xml version="1.0" encoding="Windows-1251"?>
<SI_EMASK>
<TKT Number="6179022724" Srl="Е" AirLine="ОАО ИЖАВИА" AirLineNo="23A" Traveller="КОСТИНА/НАТАЛИЯ Г-ЖА" IssueDate="13.03.07" BookRef="45Х1Ш8" AgentNo="0172" IdentityDoc="ПС1202296004" PayForm="НАЛ" SITerminal="20МОЮ" Gross="9260" TaxSum="160" Tariff="9100" PayCry="РУБ">
<Segments>
<SGT SgtNo="1" DprtCityName="МОСКВА" DprtAirPort="ДМД" AirLine="ИЖ" Flight="302" Class="Э" DprtDate="19" DprtTime="0955" Seat="17" Wcode="20К"/>
<SGT SgtNo="2" DprtDate="МА" Seat="Г"/>
</Segments>
<Taxes>
<TAX Amount="160" CryCode="RUB"/>
</Taxes>
<SrcAmounts>МОВ            
ИЖВИЖ   4550РУБ
МОВИЖ   4550РУБ
</SrcAmounts>
</TKT>
</SI_EMASK>

?Number
?Segments.Count
?Segments( 1 ).Departure.Airport.Name
?Taxes.Count

…
value = txtLoader.Eval(“Number”)
…
sgtCount =  txtLoader.Eval(“Segments.Count”)
…

For each filedef In FileDefs
   defName = filedef.Name
   For each rule In FileDefs.Rules    
       If  Not TxtLoader.Eval(rule.Text) Then 
          defName = “”
          Exit For
       End If
   Next rule 
   If defName <> “” Then Exit For
Next fileDef