xdxf =
  element xdxf {
    attlist.xdxf, full_name, description, abbreviations?, ar+
  }
full_name = element full_name { attlist.full_name, text }
attlist.full_name &= empty
description =
  element description { attlist.description, (text | em | iref)* }
attlist.description &= empty
abbreviations =
  element abbreviations { attlist.abbreviations, abr_def+ }
attlist.abbreviations &= empty
abr_def = element abr_def { attlist.abr_def, k+, v }
attlist.abr_def &= empty
v = element v { attlist.v, text }
attlist.v &= empty
ar = element ar { attlist.ar, head, (def+ & m*) }
attlist.ar &= empty
k = element k { attlist.k, (text | opt)* }
attlist.k &= empty
opt = element opt { attlist.opt, text }
attlist.opt &= empty
tr = element tr { attlist.tr, text }
attlist.tr &= empty
dtrn =
  element dtrn {
    attlist.dtrn,
    (text | abr | co | em | ex | iref | k | kref | rref | style | tr)*
  }
attlist.dtrn &= empty
kref = element kref { attlist.kref, text }
attlist.kref &= empty
rref = element rref { attlist.rref, text }
attlist.rref &= empty
iref = element iref { attlist.iref, text }
attlist.iref &= empty
abr = element abr { attlist.abr, text }
attlist.abr &= empty
ex =
  element ex {
    attlist.ex,
    (text
     | abr
     | co
     | em
     | iref
     | k
     | kref
     | quote
     | rref
     | style
     | tr)*
  }
attlist.ex &= empty
co =
  element co {
    attlist.co, (text | abr | ex | em | iref | k | kref | rref | tr)*
  }
attlist.co &= empty
head = element head { attlist.head, k }
attlist.head &= empty
def =
  element def {
    attlist.def,
    (text
     | abr
     | antonym
     | auxiliary
     | co
     | def
     | dtrn
     | em
     | etym
     | ex
     | field
     | gender
     | idiom
     | iref
     | k
     | kref
     | m
     | proverb
     | rref
     | style
     | synonym
     | tr
     | usage)*
  }
m =
  element m {
    attlist.m,
    (text
     | abr
     | co
     | def
     | dtrn
     | etym
     | ex
     | iref
     | k
     | kref
     | m
     | rref
     | style
     | tr)*
  }
etym =
  element etym {
    attlist.etym,
    (text
     | abr
     | co
     | dtrn
     | em
     | ex
     | iref
     | k
     | kref
     | quote
     | rref
     | source
     | tr)*
  }
attlist.etym &= empty
auxiliary =
  element auxiliary { attlist.auxiliary, (text | abr | co | style)* }
attlist.auxiliary &= empty
style = element style { attlist.style, (text | abr | co)* }
attlist.style &= empty
field = element field { attlist.field, (text | abr | co)* }
attlist.field &= empty
gender = element gender { attlist.gender, (text | abr | co | style)* }
attlist.gender &= empty
synonym =
  element synonym {
    attlist.synonym,
    (text | abr | co | em | ex | iref | k | kref | quote)*
  }
attlist.synonym &= empty
antonym =
  element antonym {
    attlist.antonym,
    (text | abr | co | em | ex | iref | k | kref | quote)*
  }
attlist.antonym &= empty
usage =
  element usage {
    attlist.usage,
    (text | abr | co | em | ex | iref | k | kref | quote)*
  }
attlist.usage &= empty
idiom = element idiom { attlist.idiom, (text | def | k)* }
attlist.idiom &= empty
proverb = element proverb { attlist.proverb, (text | def | k)* }
attlist.proverb &= empty
quote =
  element quote {
    attlist.quote, (text | author | em | iref | k | kref | source)*
  }
attlist.quote &= empty
author =
  element author { attlist.author, (text | em | iref | k | kref)* }
attlist.author &= empty
source =
  element source { attlist.source, (text | em | iref | k | kref)* }
attlist.source &= empty
em = element em { attlist.em, text }
attlist.em &= empty
attlist.xdxf &=
  attribute lang_from {
    "AAR"
    | "ABK"
    | "ACE"
    | "ACH"
    | "ADA"
    | "ADY"
    | "AFA"
    | "AFH"
    | "AFR"
    | "AIN"
    | "AKA"
    | "AKK"
    | "ALB"
    | "ALE"
    | "ALG"
    | "ALT"
    | "AMH"
    | "ANG"
    | "APA"
    | "ARA"
    | "ARC"
    | "ARG"
    | "ARM"
    | "ARN"
    | "ARP"
    | "ART"
    | "ARW"
    | "ASM"
    | "AST"
    | "ATH"
    | "AUS"
    | "AVA"
    | "AVE"
    | "AWA"
    | "AYM"
    | "AZE"
    | "BAD"
    | "BAI"
    | "BAK"
    | "BAL"
    | "BAM"
    | "BAN"
    | "BAQ"
    | "BAS"
    | "BAT"
    | "BEJ"
    | "BEL"
    | "BEM"
    | "BEN"
    | "BER"
    | "BHO"
    | "BIH"
    | "BIK"
    | "BIN"
    | "BIS"
    | "BLA"
    | "BNT"
    | "BOS"
    | "BRA"
    | "BRE"
    | "BTK"
    | "BUA"
    | "BUG"
    | "BUL"
    | "BUR"
    | "BYN"
    | "CAD"
    | "CAI"
    | "CAR"
    | "CAT"
    | "CAU"
    | "CEB"
    | "CEL"
    | "CHA"
    | "CHB"
    | "CHE"
    | "CHG"
    | "CHI"
    | "CHK"
    | "CHM"
    | "CHN"
    | "CHO"
    | "CHP"
    | "CHR"
    | "CHU"
    | "CHV"
    | "CHY"
    | "CMC"
    | "COP"
    | "COR"
    | "COS"
    | "CPE"
    | "CPF"
    | "CPP"
    | "CRE"
    | "CRH"
    | "CRP"
    | "CSB"
    | "CUS"
    | "CZE"
    | "DAK"
    | "DAN"
    | "DAR"
    | "DAY"
    | "DEL"
    | "DEN"
    | "DGR"
    | "DIN"
    | "DIV"
    | "DOI"
    | "DRA"
    | "DSB"
    | "DUA"
    | "DUM"
    | "DUT"
    | "DYU"
    | "DZO"
    | "EFI"
    | "EGY"
    | "EKA"
    | "ELX"
    | "ENG"
    | "ENM"
    | "EPO"
    | "EST"
    | "EWE"
    | "EWO"
    | "FAN"
    | "FAO"
    | "FAT"
    | "FIJ"
    | "FIL"
    | "FIN"
    | "FIU"
    | "FON"
    | "FRE"
    | "FRM"
    | "FRO"
    | "FRY"
    | "FUL"
    | "FUR"
    | "GAA"
    | "GAY"
    | "GBA"
    | "GEM"
    | "GEO"
    | "GER"
    | "GEZ"
    | "GIL"
    | "GLA"
    | "GLE"
    | "GLG"
    | "GLV"
    | "GMH"
    | "GOH"
    | "GON"
    | "GOR"
    | "GOT"
    | "GRB"
    | "GRC"
    | "GRE"
    | "GRN"
    | "GUJ"
    | "GWI"
    | "HAI"
    | "HAT"
    | "HAU"
    | "HAW"
    | "HEB"
    | "HER"
    | "HIL"
    | "HIM"
    | "HIN"
    | "HIT"
    | "HMN"
    | "HMO"
    | "HSB"
    | "HUN"
    | "HUP"
    | "IBA"
    | "IBO"
    | "ICE"
    | "IDO"
    | "III"
    | "IJO"
    | "IKU"
    | "ILE"
    | "ILO"
    | "INA"
    | "INC"
    | "IND"
    | "INE"
    | "INH"
    | "IPK"
    | "IRA"
    | "IRO"
    | "ITA"
    | "JAV"
    | "JBO"
    | "JPN"
    | "JPR"
    | "JRB"
    | "KAA"
    | "KAB"
    | "KAC"
    | "KAL"
    | "KAM"
    | "KAN"
    | "KAR"
    | "KAS"
    | "KAU"
    | "KAW"
    | "KAZ"
    | "KBD"
    | "KHA"
    | "KHI"
    | "KHM"
    | "KHO"
    | "KIK"
    | "KIN"
    | "KIR"
    | "KMB"
    | "KOK"
    | "KOM"
    | "KON"
    | "KOR"
    | "KOS"
    | "KPE"
    | "KRC"
    | "KRO"
    | "KRU"
    | "KUA"
    | "KUM"
    | "KUR"
    | "KUT"
    | "LAD"
    | "LAH"
    | "LAM"
    | "LAO"
    | "LAT"
    | "LAV"
    | "LEZ"
    | "LIM"
    | "LIN"
    | "LIT"
    | "LOL"
    | "LOZ"
    | "LTZ"
    | "LUA"
    | "LUB"
    | "LUG"
    | "LUI"
    | "LUN"
    | "LUO"
    | "LUS"
    | "MAC"
    | "MAD"
    | "MAG"
    | "MAH"
    | "MAI"
    | "MAK"
    | "MAL"
    | "MAN"
    | "MAO"
    | "MAP"
    | "MAR"
    | "MAS"
    | "MAY"
    | "MDF"
    | "MDR"
    | "MEN"
    | "MGA"
    | "MIC"
    | "MIN"
    | "MIS"
    | "MKH"
    | "MLG"
    | "MLT"
    | "MNC"
    | "MNI"
    | "MNO"
    | "MOH"
    | "MOL"
    | "MON"
    | "MOS"
    | "MUL"
    | "MUN"
    | "MUS"
    | "MWL"
    | "MWR"
    | "MYN"
    | "MYV"
    | "NAH"
    | "NAI"
    | "NAP"
    | "NAU"
    | "NAV"
    | "NBL"
    | "NDE"
    | "NDO"
    | "NDS"
    | "NEP"
    | "NEW"
    | "NIA"
    | "NIC"
    | "NIU"
    | "NNO"
    | "NOB"
    | "NOG"
    | "NON"
    | "NOR"
    | "NSO"
    | "NUB"
    | "NWC"
    | "NYA"
    | "NYM"
    | "NYN"
    | "NYO"
    | "NZI"
    | "OCI"
    | "OJI"
    | "ORI"
    | "ORM"
    | "OSA"
    | "OSS"
    | "OTA"
    | "OTO"
    | "PAA"
    | "PAG"
    | "PAL"
    | "PAM"
    | "PAN"
    | "PAP"
    | "PAU"
    | "PEO"
    | "PER"
    | "PHI"
    | "PHN"
    | "PLI"
    | "POL"
    | "PON"
    | "POR"
    | "PRA"
    | "PRO"
    | "PUS"
    | "QAA-QUE"
    | "RAJ"
    | "RAP"
    | "RAR"
    | "ROA"
    | "ROH"
    | "ROM"
    | "RUM"
    | "RUN"
    | "RUP"
    | "RUS"
    | "SAD"
    | "SAG"
    | "SAH"
    | "SAI"
    | "SAL"
    | "SAM"
    | "SAN"
    | "SAS"
    | "SAT"
    | "SCC"
    | "SCN"
    | "SCO"
    | "SCR"
    | "SEL"
    | "SEM"
    | "SGA"
    | "SGN"
    | "SHN"
    | "SID"
    | "SIN"
    | "SIO"
    | "SIT"
    | "SLA"
    | "SLO"
    | "SLV"
    | "SMA"
    | "SME"
    | "SMI"
    | "SMJ"
    | "SMN"
    | "SMO"
    | "SMS"
    | "SNA"
    | "SND"
    | "SNK"
    | "SOG"
    | "SOM"
    | "SON"
    | "SOT"
    | "SPA"
    | "SRD"
    | "SRR"
    | "SSA"
    | "SSW"
    | "SUK"
    | "SUN"
    | "SUS"
    | "SUX"
    | "SWA"
    | "SWE"
    | "SYR"
    | "TAH"
    | "TAI"
    | "TAM"
    | "TAT"
    | "TEL"
    | "TEM"
    | "TER"
    | "TET"
    | "TGK"
    | "TGL"
    | "THA"
    | "TIB"
    | "TIG"
    | "TIR"
    | "TIV"
    | "TKL"
    | "TLH"
    | "TLI"
    | "TMH"
    | "TOG"
    | "TON"
    | "TPI"
    | "TSI"
    | "TSN"
    | "TSO"
    | "TUK"
    | "TUM"
    | "TUP"
    | "TUR"
    | "TUT"
    | "TVL"
    | "TWI"
    | "TYV"
    | "UDM"
    | "UGA"
    | "UIG"
    | "UKR"
    | "UMB"
    | "UND"
    | "URD"
    | "UZB"
    | "VAI"
    | "VEN"
    | "VIE"
    | "VOL"
    | "VOT"
    | "WAK"
    | "WAL"
    | "WAR"
    | "WAS"
    | "WEL"
    | "WEN"
    | "WLN"
    | "WOL"
    | "XAL"
    | "XHO"
    | "YAO"
    | "YAP"
    | "YID"
    | "YOR"
    | "YPK"
    | "ZAP"
    | "ZEN"
    | "ZHA"
    | "ZND"
    | "ZUL"
    | "ZUN"
  }
attlist.xdxf &=
  attribute lang_to {
    "AAR"
    | "ABK"
    | "ACE"
    | "ACH"
    | "ADA"
    | "ADY"
    | "AFA"
    | "AFH"
    | "AFR"
    | "AIN"
    | "AKA"
    | "AKK"
    | "ALB"
    | "ALE"
    | "ALG"
    | "ALT"
    | "AMH"
    | "ANG"
    | "APA"
    | "ARA"
    | "ARC"
    | "ARG"
    | "ARM"
    | "ARN"
    | "ARP"
    | "ART"
    | "ARW"
    | "ASM"
    | "AST"
    | "ATH"
    | "AUS"
    | "AVA"
    | "AVE"
    | "AWA"
    | "AYM"
    | "AZE"
    | "BAD"
    | "BAI"
    | "BAK"
    | "BAL"
    | "BAM"
    | "BAN"
    | "BAQ"
    | "BAS"
    | "BAT"
    | "BEJ"
    | "BEL"
    | "BEM"
    | "BEN"
    | "BER"
    | "BHO"
    | "BIH"
    | "BIK"
    | "BIN"
    | "BIS"
    | "BLA"
    | "BNT"
    | "BOS"
    | "BRA"
    | "BRE"
    | "BTK"
    | "BUA"
    | "BUG"
    | "BUL"
    | "BUR"
    | "BYN"
    | "CAD"
    | "CAI"
    | "CAR"
    | "CAT"
    | "CAU"
    | "CEB"
    | "CEL"
    | "CHA"
    | "CHB"
    | "CHE"
    | "CHG"
    | "CHI"
    | "CHK"
    | "CHM"
    | "CHN"
    | "CHO"
    | "CHP"
    | "CHR"
    | "CHU"
    | "CHV"
    | "CHY"
    | "CMC"
    | "COP"
    | "COR"
    | "COS"
    | "CPE"
    | "CPF"
    | "CPP"
    | "CRE"
    | "CRH"
    | "CRP"
    | "CSB"
    | "CUS"
    | "CZE"
    | "DAK"
    | "DAN"
    | "DAR"
    | "DAY"
    | "DEL"
    | "DEN"
    | "DGR"
    | "DIN"
    | "DIV"
    | "DOI"
    | "DRA"
    | "DSB"
    | "DUA"
    | "DUM"
    | "DUT"
    | "DYU"
    | "DZO"
    | "EFI"
    | "EGY"
    | "EKA"
    | "ELX"
    | "ENG"
    | "ENM"
    | "EPO"
    | "EST"
    | "EWE"
    | "EWO"
    | "FAN"
    | "FAO"
    | "FAT"
    | "FIJ"
    | "FIL"
    | "FIN"
    | "FIU"
    | "FON"
    | "FRE"
    | "FRM"
    | "FRO"
    | "FRY"
    | "FUL"
    | "FUR"
    | "GAA"
    | "GAY"
    | "GBA"
    | "GEM"
    | "GEO"
    | "GER"
    | "GEZ"
    | "GIL"
    | "GLA"
    | "GLE"
    | "GLG"
    | "GLV"
    | "GMH"
    | "GOH"
    | "GON"
    | "GOR"
    | "GOT"
    | "GRB"
    | "GRC"
    | "GRE"
    | "GRN"
    | "GUJ"
    | "GWI"
    | "HAI"
    | "HAT"
    | "HAU"
    | "HAW"
    | "HEB"
    | "HER"
    | "HIL"
    | "HIM"
    | "HIN"
    | "HIT"
    | "HMN"
    | "HMO"
    | "HSB"
    | "HUN"
    | "HUP"
    | "IBA"
    | "IBO"
    | "ICE"
    | "IDO"
    | "III"
    | "IJO"
    | "IKU"
    | "ILE"
    | "ILO"
    | "INA"
    | "INC"
    | "IND"
    | "INE"
    | "INH"
    | "IPK"
    | "IRA"
    | "IRO"
    | "ITA"
    | "JAV"
    | "JBO"
    | "JPN"
    | "JPR"
    | "JRB"
    | "KAA"
    | "KAB"
    | "KAC"
    | "KAL"
    | "KAM"
    | "KAN"
    | "KAR"
    | "KAS"
    | "KAU"
    | "KAW"
    | "KAZ"
    | "KBD"
    | "KHA"
    | "KHI"
    | "KHM"
    | "KHO"
    | "KIK"
    | "KIN"
    | "KIR"
    | "KMB"
    | "KOK"
    | "KOM"
    | "KON"
    | "KOR"
    | "KOS"
    | "KPE"
    | "KRC"
    | "KRO"
    | "KRU"
    | "KUA"
    | "KUM"
    | "KUR"
    | "KUT"
    | "LAD"
    | "LAH"
    | "LAM"
    | "LAO"
    | "LAT"
    | "LAV"
    | "LEZ"
    | "LIM"
    | "LIN"
    | "LIT"
    | "LOL"
    | "LOZ"
    | "LTZ"
    | "LUA"
    | "LUB"
    | "LUG"
    | "LUI"
    | "LUN"
    | "LUO"
    | "LUS"
    | "MAC"
    | "MAD"
    | "MAG"
    | "MAH"
    | "MAI"
    | "MAK"
    | "MAL"
    | "MAN"
    | "MAO"
    | "MAP"
    | "MAR"
    | "MAS"
    | "MAY"
    | "MDF"
    | "MDR"
    | "MEN"
    | "MGA"
    | "MIC"
    | "MIN"
    | "MIS"
    | "MKH"
    | "MLG"
    | "MLT"
    | "MNC"
    | "MNI"
    | "MNO"
    | "MOH"
    | "MOL"
    | "MON"
    | "MOS"
    | "MUL"
    | "MUN"
    | "MUS"
    | "MWL"
    | "MWR"
    | "MYN"
    | "MYV"
    | "NAH"
    | "NAI"
    | "NAP"
    | "NAU"
    | "NAV"
    | "NBL"
    | "NDE"
    | "NDO"
    | "NDS"
    | "NEP"
    | "NEW"
    | "NIA"
    | "NIC"
    | "NIU"
    | "NNO"
    | "NOB"
    | "NOG"
    | "NON"
    | "NOR"
    | "NSO"
    | "NUB"
    | "NWC"
    | "NYA"
    | "NYM"
    | "NYN"
    | "NYO"
    | "NZI"
    | "OCI"
    | "OJI"
    | "ORI"
    | "ORM"
    | "OSA"
    | "OSS"
    | "OTA"
    | "OTO"
    | "PAA"
    | "PAG"
    | "PAL"
    | "PAM"
    | "PAN"
    | "PAP"
    | "PAU"
    | "PEO"
    | "PER"
    | "PHI"
    | "PHN"
    | "PLI"
    | "POL"
    | "PON"
    | "POR"
    | "PRA"
    | "PRO"
    | "PUS"
    | "QAA-QUE"
    | "RAJ"
    | "RAP"
    | "RAR"
    | "ROA"
    | "ROH"
    | "ROM"
    | "RUM"
    | "RUN"
    | "RUP"
    | "RUS"
    | "SAD"
    | "SAG"
    | "SAH"
    | "SAI"
    | "SAL"
    | "SAM"
    | "SAN"
    | "SAS"
    | "SAT"
    | "SCC"
    | "SCN"
    | "SCO"
    | "SCR"
    | "SEL"
    | "SEM"
    | "SGA"
    | "SGN"
    | "SHN"
    | "SID"
    | "SIN"
    | "SIO"
    | "SIT"
    | "SLA"
    | "SLO"
    | "SLV"
    | "SMA"
    | "SME"
    | "SMI"
    | "SMJ"
    | "SMN"
    | "SMO"
    | "SMS"
    | "SNA"
    | "SND"
    | "SNK"
    | "SOG"
    | "SOM"
    | "SON"
    | "SOT"
    | "SPA"
    | "SRD"
    | "SRR"
    | "SSA"
    | "SSW"
    | "SUK"
    | "SUN"
    | "SUS"
    | "SUX"
    | "SWA"
    | "SWE"
    | "SYR"
    | "TAH"
    | "TAI"
    | "TAM"
    | "TAT"
    | "TEL"
    | "TEM"
    | "TER"
    | "TET"
    | "TGK"
    | "TGL"
    | "THA"
    | "TIB"
    | "TIG"
    | "TIR"
    | "TIV"
    | "TKL"
    | "TLH"
    | "TLI"
    | "TMH"
    | "TOG"
    | "TON"
    | "TPI"
    | "TSI"
    | "TSN"
    | "TSO"
    | "TUK"
    | "TUM"
    | "TUP"
    | "TUR"
    | "TUT"
    | "TVL"
    | "TWI"
    | "TYV"
    | "UDM"
    | "UGA"
    | "UIG"
    | "UKR"
    | "UMB"
    | "UND"
    | "URD"
    | "UZB"
    | "VAI"
    | "VEN"
    | "VIE"
    | "VOL"
    | "VOT"
    | "WAK"
    | "WAL"
    | "WAR"
    | "WAS"
    | "WEL"
    | "WEN"
    | "WLN"
    | "WOL"
    | "XAL"
    | "XHO"
    | "YAO"
    | "YAP"
    | "YID"
    | "YOR"
    | "YPK"
    | "ZAP"
    | "ZEN"
    | "ZHA"
    | "ZND"
    | "ZUL"
    | "ZUN"
  }
attlist.xdxf &= attribute format { "logical" }
attlist.def &=
  attribute l { text }?,
  attribute pos {
    "noun"
    | "verb"
    | "auxiliary verb"
    | "adjective"
    | "adverb"
    | "pronoun"
    | "indefinite article"
    | "definite article"
    | "preposition"
    | "postposition"
    | "conjunction"
    | "interjection"
    | "measure"
    | "quantifier"
  }?,
  attribute transitivity { "transitive" | "intransitive" }?,
  attribute separability { "separable" | "inseparable" }?,
  attribute reflexivity { "reflexive" | "nonreflexive" }?
attlist.m &=
  attribute pos {
    "noun"
    | "verb"
    | "auxiliary verb"
    | "adjective"
    | "adverb"
    | "pronoun"
    | "indefinite article"
    | "definite article"
    | "preposition"
    | "postposition"
    | "conjunction"
    | "interjection"
    | "measure"
    | "quantifier"
  }?,
  attribute gender { "masculine" | "feminine" | "neuter" }?,
  attribute number { "singular" | "dual" | "plural" }?,
  attribute case {
    "nominative" | "accusative" | "dative" | "genitive" | "vocative"
  }?,
  attribute person { "1" | "2" | "3" }?,
  attribute verbal { "infinitive" | "participle" | "gerund" }?,
  attribute mood {
    "indicative"
    | "conditional"
    | "subjunctive"
    | "subjunctive I"
    | "subjunctive II"
    | "imperative"
  }?,
  attribute tense { "past" | "preterite" | "present" | "future" }?,
  attribute aspect { "perfective" | "imperfective" }?,
  attribute definiteness { "definite" | "indefinite" }?,
  attribute voice { "active" | "passive" }?,
  attribute degree { "positive" | "comparative" | "superlative" }?
start = xdxf