Provided by: mmorph_2.3.4.2-15_amd64 
NAME
mmorph - MULTEXT morphology tool formalism syntax
DESCRIPTION
A mmorph morphology description file is divided into declaration sections. Each section
starts by a section header (`@ Alphabets', `@ Attributes', etc.) followed by a sequence
of declarations. Each declaration starts by a name, followed by a colon (`:') and the
definition associated to the name. Here is a brief description of each section:
@ Alphabets
In this section the lexical and surface alphabet are declared. All symbols forming each
alphabet has to be listed. Symbols may appear in both the lexical and surface alphabet
definition in which case it is considered a bi-level symbol, otherwise it is a lexical
only or surface only symbol. Symbols are usually letters (eg. a, b, c) , but may also
consist of longer names (beta, schwa). Symbol names consisting of one special character
(`:' or `(') may be specified by enclosing them in double quotes (`:' or `(').
Example:
Lexical : a b c d e f g h i j k l m n o p q r s t u v w x y z "-" "." "," "?" "!"
"\"" "'" ":" ";" "(" ")" strong_e
Surface : a b c d e f g h i j k l m n o p q r s t u v w x y z "-" "." "," "?" "!"
"\"" "'" ":" ";" "(" ")" " "
In this example, the symbol strong_e is lexical only, the symbol " " (space) is surface
only. All the other symbols are bi-level.
All the strings appearing in the rest of the grammar will be made exclusively of symbols
declared in this section.
@ Attributes
In this section, the name of attributes (sometimes called features) and their associated
value set. At most 32 different values may be declared for an attribute.
Examples:
Gender : feminine masculine neuter
Number : singular plural
Person : 1st 2nd 3rd
Transitive : yes no
Inflection : base intermediate final
In the current version of the implementation value sets of different attributes are
incompatible, even if they are defined identically. To overcome this restriction, in a
future version this section will be split into two: declaration of value sets and
declaration of attributes.
@ Types
In this section, the different types of feature structures are declared. The attributes
allowed for each type are listed. Attributes that are only used within the scope of the
tool and have no meaning outside can be listed after a bar (`|'). The values of these
local attributes ar not stored in the database or written on the final output of the
program.
Examples:
Noun : Gender Number
Verb : Tense Person Gender Number Transitive | Inflection
Typed feature structures
Typed feature structures are used in the grammar and spelling rules. It is the
specification of a type and the value of some associated attributes. The list of
attribute specifications is enclosed in square brackets (`[' and `]').
Example:
Noun[ Gender=feminine Number=singular ]
It is possible to specify a set of values for an attribute by listing the possible valuse
separated with a bar (`|'), or the complement of a set (with respect to all possible
values of that attribute) indicated with `!=' instead of `='.
Example: Assuming the declaration of Gender as above, the following two typed feature
structures are equivalent
Noun[ Gender=masculine|neuter ]
Noun[ Gender!=feminine ]
@ Grammar
This section contains the rules that specify the structure of words. It has the general
shape of a context free grammar over typed feature structures. There are three basic
types of rules: binary, goal and affixes.
Binary rules specify the result of the concatenation of two elements. This is written as:
Rule_name : Lhs <- Rhs1 Rhs2
where Lhs is called the left hand side, and Rhs1 and Rhs2 the first and second part of the
right hand side. Lhs, Rhs1 and Rhs2 are specified as typed feature structures.
Example:
Rule_1 : Noun[ Gender=feminine Number=singular ]
<- Noun[ Gender=feminine Number=singular ]
NounSuffix[ Gender=feminine ]
Variables can be used to indicate that some attributes have the same value. A variable is
a name starting with a dollar (`$').
Example:
Rule_2 : Noun[ Gender=$A Number=$number ]
<- Noun[ Gender=$A Number=$number ]
NounSuffix[ Gender=$A ]
If needed, both a variable and a value specification can be given for an attribute (only
once per attribute):
Example:
Rule_3 : Noun[ Gender=$A Number=$number ]
<- Noun[ Gender=$A Number=$number ]
NounSuffix[ Gender=$A=masculine|neuter ]
Affix rules define basic elements of the concatenations specified by binary rules
(together with lexical entries, see the section @ Lexicon below). An affix rule consists
of lexical string associated to a typed feature structure.
Examples:
Plural_s : "s" NounSuffix[ Number=plural ]
Feminine_e : "e" NounSuffix[ Gender=feminine ]
ing : "ing" VerbSuffix[ Tense=present_participle ]
Goal rules specify the valid results constructed by the grammar. They consist of just a
typed feature structure.
Examples:
Goal_1 : Noun[]
Goal_2 : Verb[ inflection=final ]
In addition to these three basic rule types, there are prefix or suffix composite rules
and unary rules. A unary rule consist of a left hand side and a right hand side.
Example:
Rule_4 : Noun[ gender=$G number=plural ]
<- Noun[ gender=$G number=singular invariant=yes]
Prefix and suffix composite rules have the same shape as binary rules except that one part
of the right hand side is an affix (i.e. has an associated string).
Examples:
Append_e : Noun[ Gender=feminine Number=$number ]
<- Noun[ Gender=feminine Number=$number ]
"e" NounSuffix[ Gender=feminine ]
anti : Noun[ Gender=$gender Number=$number ]
<- "anti" NounPrefix[]
Noun[ Gender=$gender Number=$number ]
@ Classes
This optional section contains the definition of symbol classes. Each class is defined as
a set of symbols, or other classes. If the class contains only bi-level elements it is a
bi-level class, otherwise it is a lexical or surface class.
Examples:
Dental : d t
Vowel : a e i o u
Vowel_y : Vowel y
Consonant: b c d f g h j k l m n p q r s t v w x z
@ Pairs
This optional section contains the definition of pair disjunctions. Each disjunction is
defined as a set of pairs. Explicit pairs specify a sequence of surface symbols and a
sequence of zero or one lexical symbol, one of them possibly empty. A sequence is
enclosed between angle brackets `<' and `>'. The empty sequence is indicated with `<>'.
In the current implementation only the surface part of a pair can be a sequence of more
than one element. The special symbol `?' stands for the class of all possible symbols,
including the morpheme and word boundary.
Examples:
s_x_z_1 : s/s x/x z/z
VowelPair1: a/a e/e i/i o/o u/u
VowelPair2: Vowel/Vowel
ie.y: <i e>/y
Delete_e: <>/e
Insert_d: d/<>
Surface_Vowel: Vowel/?
Lexical_s: ?/s
DoubleConsonant: <b b>/b <d d>/d <f f>/f <g g>/g <k k>/k <m m>/m <p p>/p <s s>/s
<t t>/t <v v>/v <z z>/z
Note that VowelPair1 and VowelPair2 don't specify the same thing: VowelPair2 would match
a/o but VowelPair1 would not.
Implicit pairs are specified by the name of a bi-level symbol or a bi-level class.
Examples: the following s_x_z_2 and VowelPair3 are equivalent to the above s_x_z_1 and
VowelPair2 (assuming that s, x, z and Vowel are bi-level symbols and classes).
s_x_z_2 : s x z
VowelPair3 : Vowel
In a pair disjunction all lexical parts should be disjoint. This means you cannot specify
for the same pair disjunction a/a and o/a or a/a and Vowel/Vowel.
In a future version this section will be split in two: simple pair disjunctions and pair
sequences.
@ Spelling
In this section are declared the two level spelling rules. A spelling rule consist of a
kind indicator followed by a left context a focus and a right context. The kind indicator
is `=>' if the rule is optional, `<=>' if it is obligatory and `<=' if it is a surface
coercion rule. The contexts may be empty. The focus is surrounded by two `-'. The
contexts and the focus consist of a sequence of pairs or pair disjunctions declared in the
`@ Pairs section. A morpheme boundary is indicated by a `+' or a `*', a word boundary is
indicated by a `~'.
Examples:
Sibilant_s: <=> s_x_z_1 * - e/<> - s
Gemination: <=>
Consonant Vowel - DoubleConsonant - * Vowel
i_y_optionnel: => a - i/y - * ?/e
Constraints may be specified in the form of a list of typed feature structures. They are
affix-driven: the rule is licensed if at least one of them subsumes the closest
corresponding affix. The morpheme boundary indicated by a star (`*') will be used to
determine which affix it is. If there is no such indication, then the affix adjacent to
the morpheme where the first character of the focus occurs is used. In case there is no
affix, the typed feature structure of the lexical stem is used.
Example:
Sibilant_s: <=>
s_x_z_1 * - e/<> - s NounSuffix[ Number=plural ]
@ Lexicon
This section is optional and can also be repeated. This section lists all the lexical
entries of the morphological description. Unlike the other sections, definitions do not
have a name. A definition consist of a typed feature strucure followed by a list of
lexical stems that share that feature structure. A lexical stem consists of the string
used in the concatenation specified by the grammar rules followed by `=' and a reference
string. The reference string can be anything and usually is used to indicate the
canonical form of the word or an identifier of an external database entry.
Examples:
Noun[ Number=singular ] "table" = "table" "chair" = "chair"
Verb[ Transitive=yes|no Inflection=base ] "bow" = "bow1"
Noun[ Number=singular ] "bow" = "bow2"
If the stem string and the reference strings are identical, only one needs to be
specified.
Example:
Noun[ Number=singular ] "table" "chair"
FORMAL SYNTAX
The formal syntax description below is in Backus Naur Form (BNF). The following
conventions apply:
<id> is a non-terminal symbol (within angle brackets).
ID is a token (terminal symbol, all uppercase).
<id>? means zero or one occurrence of <id> (i.e. <id> is optional).
<id>* is zero or more occurrences of <id>.
<id>+ is one or more occurrences of <id>.
::= separates a non-terminal symbol and its expansion.
| indicates an alternative expansion.
; starts a comment (not part of the definition).
The start symbol corresponding to a complete description is named <Start>. Symbols that
parse but do nothing are marked with `; not operational'.
<Start> ::= <AlphabetDecl> <AttDecl> <TypeDecl> <GramDecl>
<ClassDecl>? <PairDecl>? <SpellDecl>? <LexDecl>*
<AlphabetDecl> ::= ALPHABETS <LexicalDef> <SurfaceDef>
<LexicalDef> ::= <LexicalName> COLON <LexicalSymbol>+
<SurfaceDef> ::= <SurfaceName> COLON <SurfaceSymbol>+
<LexicalSymbol> ::= <LexicalSymbolName> ; lexical only
| <BiLevelSymbolName> ; both lexical and surface
<SurfaceSymbol> ::= <SurfaceSymbolName> ; surface only
| <BiLevelSymbolName> ; both lexical and surface
<AttDecl> ::= ATTRIBUTES <AttDef>+
<AttDef> ::= <AttName> COLON <ValName>+
<TypeDecl> ::= TYPES <TypeDef>+
<TypeDef> ::= <TypeName> COLON <AttName>+ <NoProjAtt>?
<NoProjAtt> ::= BAR <AttName>+
<LexDecl> ::= LEXICON <LexDef>+
<LexDef> ::= <Tfs> <Lexical>+
<Lexical> ::= LEXICALSTRING <BaseForm>?
<BaseForm> ::= EQUAL LEXICALSTRING
<Tfs> ::= <TypeName> <AttSpec>?
<VarTfs> ::= <TypeName> <VarAttSpec>?
<AttSpec> ::= LBRA <AttVal>* RBRA
<VarAttSpec> ::= LBRA <VarAttVal>* RBRA
<AttVal> ::= <AttName> <ValSpec>
<VarAttVal> ::= <AttName> <VarValSpec>
<ValSpec> ::= EQUAL <ValSet>
| NOTEQUAL <ValSet>
<VarValSpec> ::= <ValSpec>
| EQUAL DOLLAR <VarName>
| EQUAL DOLLAR <VarName> <ValSpec>
<ValSet> ::= <ValName> <ValSetRest>*
<ValSetRest> ::= BAR <ValName>
<GramDecl> ::= GRAMMAR <Rule>+
<RuleDef> ::= <RuleName> COLON <RuleBody>
<RuleBody> ::= <VarTfs> LARROW <Rhs>
| <Tfs> ; goal rule
| LEXICALSTRING <Tfs> ; lexical affix
<Rhs> ::= <VarTfs> ; unary rule
| <VarTfs> <VarTfs> ; binary rule
| LEXICALSTRING <Tfs> <VarTfs> ; prefix rule
| <VarTfs> <Tfs> LEXICALSTRING ; suffix rule
<ClassDecl> ::= CLASSES<ClassDef>+
<ClassDef> ::= <LexicalClassName> COLON <LexicalClass>+
| <SurfaceClassName> COLON <SurfaceClass>+
| <BiLevelClassName> COLON <BiLevelClass>+
<LexicalClass> ::= <LexicalSymbol>
| <LexicalClassName>
| <BiLevelClassName>
<SurfaceClass> ::= <SurfaceSymbol>
| <SurfaceClassName>
| <BiLevelClassName>
<BiLevelClass> ::= <BiLevelSymbolName>
| <BiLevelClassName>
<PairDecl> ::= PAIRS <PairDef>+
<PairDef> ::= <PairName> COLON <PairDef>+
<PairDef> ::= <PairName> COLON <Pair>+
<Pair> ::= <SurfaceSequence> SLASH <LexicalSequence>
| <PairName>
| <BiLevelClassName>
| <BiLevelSymbolName>
SurfaceSequence ::= LANGLE <SurfaceSymbol>* RANGLE
| SURFACESTRING
| <SurfaceClass>
| ANY
LexicalSequence ::= LANGLE <LexicalSymbol>* RANGLE
| LEXICALSTRING
| <LexicalClass>
| ANY
<SpellDecl> ::= SPELLING <SpellDef>+
<SpellDef> ::= <SpellName> COLON <Arrow> <LeftContext> <Focus>
<RightContext> <Constraint>*
<LeftContext> ::= <Pattern>*
<RightContext> ::= <Pattern>*
<Focus> ::= CONTEXTBOUNDARY <Pattern>+ CONTEXTBOUNDARY
<Pattern> ::= <Pair>
| MORPHEMEBOUNDARY
| WORDBOUNDARY
| CONCATBOUNDARY
<Constraint> ::= <Tfs>
<Arrow> ::= RARROW
| BIARROW
| COERCEARROW
<AttName> ::= NAME
<BiLevelClassName> ::= NAME
<BiLevelSymbolName> ::= NAME | SYMBOLSTRING
<LexicalClassName> ::= NAME
<LexicalName> ::= NAME
<LexicalSymbolName> ::= NAME | SYMBOLSTRING
<PairName> ::= NAME
<RuleName> ::= NAME
<SpellName> ::= NAME
<SurfaceClassName> ::= NAME
<SurfaceName> ::= NAME
<SurfaceSymbolName> ::= NAME | SYMBOLSTRING
<TypeName> ::= NAME
<ValName> ::= NAME
<VarName> ::= NAME
Simple tokens
Simple tokens of the BNF above are defined as follow: The token name on the left
correspond to the literal character or characters on the right:
ANY ?
BAR |
BIARROW <=>
COERCEARROW <=
COLON :
CONCATBOUNDARY *
CONTEXTBOUNDARY -
DOLLAR $
EQUAL =
LANGLE <
LARROW <-
LBRA ]
MORPHEMEBOUNDARY +
NOTEQUAL !=
RARROW =>
RANGLE <
RBRA [
SLASH /
WORDBOUNDARY ~
ALPHABETS @Alphabets
ATTRIBUTES @Attributes
CLASSES @Classes
GRAMMAR @Grammar
LEXICON @Lexicon
PAIRS @Pairs
SPELLING @Spelling
TYPES @Types
In the section header tokens above, spaces may separate the `@' from the reserved word.
Complex tokens
NAME
is any sequence of letter, digit, underline (`_'), period (`.')
Examples:
category
33
Rule_9
__2__
Proper.Noun
LEXICALSTRING
is a string of lexical symbols
SURFACESTRING
is a string of surface symbols
SYMBOLSTRING
is a string of just just one character (used only in alphabet declaration).
A string consist of zero or more characters within double quotes (`"'). Characters
preceded by a backslash (`\') are escaped (the usual C escaping convention apply).
Symbols that have a name longer than one character are represented using a SGML entity
like notation: `&symbolname;'. The maximum number of symbols in a string is 127.
Examples:
"table"
","
""
"double quote is \" and backslash is \\"
"&strong_e;"
"escape like in C : \t is ASCII tab"
"escape with octal code: \011 is ASCII tab"
Tokens can be separated by one or many blanks or comments.
A blank separator is space, tab or newline.
A comment starts with a semicolon and finishes at the next newline (except when the
semicolon occurs in a string.
Inclusion of files can be specified with the usual `#include' directive:
Example:
#include "verb.entries"
will splice in the content of the file verb.entries at the point where this directive
occurs.
The `#' should be the first character on the line. Tabs or spaces may separate `#' and
`include'. The file name must be quoted. Only tabs or spaces may occur on the rest of
the line. Inclusion can be nested up to 10 levels.
SEE ALSO
mmorph(1).
G. Russell and D. Petitpierre, MMORPH - The Multext Morphology Program, Version 2.3,
October 1995, MULTEXT deliverable report for task 2.3.1.
AUTHOR
Dominique Petitpierre, ISSCO, <petitp@divsun.unige.ch>
COMMENTS
The parser for the morphology description formalims above was written using yacc (1) and
flex (1). Flex was written by Vern Paxson, <vern@ee.lbl.gov>, and is distributed in the
framework of the GNU project under the condition of the GNU General Public License
Version 2.3, October 1995 MMORPH(5)