# Grammar

The Logtalk grammar is here described using Backus-Naur Form syntax. Non-terminal symbols in italics have the definition found in the ISO Prolog Core standard. Terminal symbols are represented in a `fixed width font` and between double-quotes.

## Entities

entity ::=
object |
category |
protocol

## Object definition

object ::=
begin_object_directive [ object_terms ] end_object_directive.
begin_object_directive ::=
“`:- object(`” object_identifier [ “`,`” object_relations ] “`).`”
end_object_directive ::=
“`:- end_object.`”
object_relations ::=
prototype_relations |
non_prototype_relations
prototype_relations ::=
prototype_relation |
prototype_relation “`,`” prototype_relations
prototype_relation ::=
implements_protocols |
imports_categories |
extends_objects
non_prototype_relations ::=
non_prototype_relation |
non_prototype_relation “`,`” non_prototype_relations
non_prototype_relation ::=
implements_protocols |
imports_categories |
instantiates_classes |
specializes_classes

## Category definition

category ::=
begin_category_directive [ category_terms ] end_category_directive.
begin_category_directive ::=
“`:- category(`” category_identifier [ “`,`” category_relations ] “`).`”
end_category_directive ::=
“`:- end_category.`”
category_relations ::=
category_relation |
category_relation “`,`” category_relations
category_relation ::=
implements_protocols |
extends_categories |
complements_objects

## Protocol definition

protocol ::=
begin_protocol_directive [ protocol_directives ] end_protocol_directive.
begin_protocol_directive ::=
“`:- protocol(`” protocol_identifier [ “`,`” extends_protocols ] “`).`”
end_protocol_directive ::=
“`:- end_protocol.`”

## Entity relations

extends_protocols ::=
“`extends(`” extended_protocols “`)`”
extends_objects ::=
“`extends(`” extended_objects “`)`”
extends_categories ::=
“`extends(`” extended_categories “`)`”
implements_protocols ::=
“`implements(`” implemented_protocols “`)`”
imports_categories ::=
“`imports(`” imported_categories “`)`”
instantiates_classes ::=
“`instantiates(`” instantiated_objects “`)`”
specializes_classes ::=
“`specializes(`” specialized_objects “`)`”
complements_objects ::=
“`complements(`” complemented_objects “`)`”

### Implemented protocols

implemented_protocols ::=
implemented_protocol |
implemented_protocol_sequence |
implemented_protocol_list
implemented_protocol ::=
protocol_identifier |
scope “`::`” protocol_identifier
implemented_protocol_sequence ::=
implemented_protocol |
implemented_protocol “`,`” implemented_protocol_sequence
implemented_protocol_list ::=
“`[`” implemented_protocol_sequence “`]`”

### Extended protocols

extended_protocols ::=
extended_protocol |
extended_protocol_sequence |
extended_protocol_list
extended_protocol ::=
protocol_identifier |
scope “`::`” protocol_identifier
extended_protocol_sequence ::=
extended_protocol |
extended_protocol “`,`” extended_protocol_sequence
extended_protocol_list ::=
“`[`” extended_protocol_sequence “`]`”

### Imported categories

imported_categories ::=
imported_category |
imported_category_sequence |
imported_category_list
imported_category ::=
category_identifier |
scope “`::`” category_identifier
imported_category_sequence ::=
imported_category |
imported_category “`,`” imported_category_sequence
imported_category_list ::=
“`[`” imported_category_sequence “`]`”

### Extended objects

extended_objects ::=
extended_object |
extended_object_sequence |
extended_object_list
extended_object ::=
object_identifier |
scope “`::`” object_identifier
extended_object_sequence ::=
extended_object |
extended_object “`,`” extended_object_sequence
extended_object_list ::=
“`[`” extended_object_sequence “`]`”

### Extended categories

extended_categories ::=
extended_category |
extended_category_sequence |
extended_category_list
extended_category ::=
category_identifier |
scope “`::`” category_identifier
extended_category_sequence ::=
extended_category |
extended_category “`,`” extended_category_sequence
extended_category_list ::=
“`[`” extended_category_sequence “`]`”

### Instantiated objects

instantiated_objects ::=
instantiated_object |
instantiated_object_sequence |
instantiated_object_list
instantiated_object ::=
object_identifier |
scope “`::`” object_identifier
instantiated_object_sequence ::=
instantiated_object
instantiated_object “`,`” instantiated_object_sequence |
instantiated_object_list ::=
“`[`” instantiated_object_sequence “`]`”

### Specialized objects

specialized_objects ::=
specialized_object |
specialized_object_sequence |
specialized_object_list
specialized_object ::=
object_identifier |
scope “`::`” object_identifier
specialized_object_sequence ::=
specialized_object |
specialized_object “`,`” specialized_object_sequence
specialized_object_list ::=
“`[`” specialized_object_sequence “`]`”

### Complemented objects

complemented_objects ::=
object_identifier |
complemented_object_sequence |
complemented_object_list
complemented_object_sequence ::=
object_identifier |
object_identifier “`,`” complemented_object_sequence
complemented_object_list ::=
“`[`” complemented_object_sequence “`]`”

### Entity and predicate scope

scope ::=
“`public`” |
“`protected`” |
“`private`”

## Entity identifiers

entity_identifiers ::=
entity_identifier |
entity_identifier_sequence |
entity_identifier_list
entity_identifier ::=
object_identifier |
protocol_identifier |
category_identifier
entity_identifier_sequence ::=
entity_identifier |
entity_identifier “`,`” entity_identifier_sequence
entity_identifier_list ::=
“`[`” entity_identifier_sequence “`]`”

### Object identifiers

object_identifiers ::=
object_identifier |
object_identifier_sequence |
object_identifier_list
object_identifier ::=
atom |
compound
object_identifier_sequence ::=
object_identifier |
object_identifier “`,`” object_identifier_sequence
object_identifier_list ::=
“`[`” object_identifier_sequence “`]`”

### Category identifiers

category_identifiers ::=
category_identifier |
category_identifier_sequence |
category_identifier_list
category_identifier ::=
atom |
compound
category_identifier_sequence ::=
category_identifier |
category_identifier “`,`” category_identifier_sequence
category_identifier_list ::=
“`[`” category_identifier_sequence “`]`”

### Protocol identifiers

protocol_identifiers ::=
protocol_identifier |
protocol_identifier_sequence |
protocol_identifier_list
protocol_identifier ::=
atom
protocol_identifier_sequence ::=
protocol_identifier |
protocol_identifier “`,`” protocol_identifier_sequence
protocol_identifier_list ::=
“`[`” protocol_identifier_sequence “`]`”

### Module identifiers

module_identifier ::=
atom

## Source file names

source_file_names ::=
source_file_name |
source_file_name_list
source_file_name ::=
atom |
library_source_file_name
library_source_file_name ::=
library_name “`(`” atom “`)`”
library_name ::=
atom
source_file_name_sequence ::=
source_file_name |
source_file_name “`,`” source_file_name_sequence
source_file_name_list ::=
“`[`” source_file_name_sequence “`]`”

## Terms

### Object terms

object_terms ::=
object_term |
object_term object_terms
object_term ::=
object_directive |
clause |
grammar_rule

### Category terms

category_terms ::=
category_term |
category_term category_terms
category_term ::=
category_directive |
clause |
grammar_rule

## Directives

### Source file directives

source_file_directives ::=
source_file_directive |
source_file_directive source_file_directives
source_file_directive ::=
“`:- encoding(`” atom “`).`” |
“`:- set_logtalk_flag(`” atom “`,`” nonvar “`).`” |
“`:- include(`” source_file_name “`).`”
Prolog directives

### Conditional compilation directives

conditional_compilation_directives ::=
conditional_compilation_directive |
conditional_compilation_directive conditional_compilation_directives
conditional_compilation_directive ::=
“`:- if(`” callable “`).`” |
“`:- elif(`” callable “`).`” |
“`:- else.`” |
“`:- endif.`”

### Object directives

object_directives ::=
object_directive |
object_directive object_directives
object_directive ::=
“`:- initialization(`” callable “`).`” |
“`:- built_in.`” |
“`:- threaded.`” |
“`:- dynamic.`” |
“`:- info(`” entity_info_list “`).`” |
“`:- set_logtalk_flag(`” atom “`,`” nonvar “`).`” |
“`:- include(`” source_file_name “`).`” |
“`:- uses(`” object_alias_list “`).`” |
predicate_directives

### Category directives

category_directives ::=
category_directive |
category_directive category_directives
category_directive ::=
“`:- built_in.`” |
“`:- dynamic.`” |
“`:- info(`” entity_info_list “`).`” |
“`:- set_logtalk_flag(`” atom “`,`” nonvar “`).`” |
“`:- include(`” source_file_name “`).`” |
“`:- uses(`” object_alias_list “`).`” |
predicate_directives

### Protocol directives

protocol_directives ::=
protocol_directive |
protocol_directive protocol_directives
protocol_directive ::=
“`:- built_in.`” |
“`:- dynamic.`” |
“`:- info(`” entity_info_list “`).`” |
“`:- set_logtalk_flag(`” atom “`,`” nonvar “`).`” |
“`:- include(`” source_file_name “`).`” |
predicate_directives

### Predicate directives

predicate_directives ::=
predicate_directive |
predicate_directive predicate_directives
predicate_directive ::=
alias_directive |
synchronized_directive |
uses_directive |
use_module_directive |
scope_directive |
mode_directive |
meta_predicate_directive |
meta_non_terminal_directive |
info_directive |
dynamic_directive |
discontiguous_directive |
multifile_directive |
coinductive_directive |
operator_directive
alias_directive ::=
“`:- alias(`”
entity_identifier “`,`”
predicate_indicator_alias_list | non_terminal_indicator_alias_list
“`).`”
synchronized_directive ::=
“`:- synchronized(`” predicate_indicator_term | non_terminal_indicator_term “`).`”
uses_directive ::=
“`:- uses(`”
object_identifier | parameter_variable “`,`”
predicate_indicator_alias_list | non_terminal_indicator_alias_list | operator_list
“`).`”
use_module_directive ::=
“`:- use_module(`”
module_identifier | parameter_variable “`,`”
module_predicate_indicator_alias_list | module_non_terminal_indicator_alias_list | operator_list
“`).`”
scope_directive ::=
“`:- public(`” predicate_indicator_term | non_terminal_indicator_term “`).`” |
“`:- protected(`” predicate_indicator_term | non_terminal_indicator_term “`).`” |
“`:- private(`” predicate_indicator_term | non_terminal_indicator_term “`).`”
mode_directive ::=
“`:- mode(`”
predicate_mode_term | non_terminal_mode_term “`,`”
number_of_proofs
“`).`”
meta_predicate_directive ::=
“`:- meta_predicate(`” meta_predicate_template_term “`).`”
meta_non_terminal_directive ::=
“`:- meta_non_terminal(`” meta_non_terminal_template_term “`).`”
info_directive ::=
“`:- info(`”
predicate_indicator | non_terminal_indicator “`,`”
predicate_info_list
“`).`”
dynamic_directive ::=
“`:- dynamic(`” qualified_predicate_indicator_term | qualified_non_terminal_indicator_term “`).`”
discontiguous_directive ::=
“`:- discontiguous(`” predicate_indicator_term |
non_terminal_indicator_term “`).`”
multifile_directive ::=
“`:- multifile(`” qualified_predicate_indicator_term |
qualified_non_terminal_indicator_term “`).`”
coinductive_directive ::=
“`:- coinductive(`” predicate_indicator_term |
coinductive_predicate_template_term “`).`”
parameter_variable ::=
_variable_
entity_resources_list ::=
predicate_indicator_list |
operator_list
predicate_indicator_term ::=
predicate_indicator |
predicate_indicator_sequence |
predicate_indicator_list
predicate_indicator_sequence ::=
predicate_indicator |
predicate_indicator “`,`” predicate_indicator_sequence
predicate_indicator_list ::=
“`[`” predicate_indicator_sequence “`]`”
qualified_predicate_indicator_term ::=
qualified_predicate_indicator |
qualified_predicate_indicator_sequence |
qualified_predicate_indicator_list
qualified_predicate_indicator_sequence ::=
qualified_predicate_indicator |
qualified_predicate_indicator “`,`” qualified_predicate_indicator_sequence
qualified_predicate_indicator_list ::=
“`[`” qualified_predicate_indicator_sequence “`]`”
qualified_predicate_indicator ::=
predicate_indicator |
object_identifier “`::`” predicate_indicator |
category_identifier “`::`” predicate_indicator |
module_identifier “`:`” predicate_indicator
predicate_indicator_alias ::=
predicate_indicator |
predicate_indicator “`as`” predicate_indicator |
predicate_indicator “`::`” predicate_indicator
predicate_indicator_alias_sequence ::=
predicate_indicator_alias |
predicate_indicator_alias “`,`” predicate_indicator_alias_sequence
predicate_indicator_alias_list ::=
“`[`” predicate_indicator_alias_sequence “`]`”
predicate_template_alias ::=
callable “`as`” callable |
callable “`::`” callable
predicate_template_alias_sequence ::=
predicate_template_alias |
predicate_template_alias “`,`” predicate_template_alias_sequence
predicate_template_alias_list ::=
“`[`” predicate_template_alias_sequence “`]`”
module_predicate_indicator_alias ::=
predicate_indicator |
predicate_indicator “`as`” predicate_indicator |
predicate_indicator “`:`” predicate_indicator
module_predicate_indicator_alias_sequence ::=
module_predicate_indicator_alias |
module_predicate_indicator_alias “`,`” module_predicate_indicator_alias_sequence
module_predicate_indicator_alias_list ::=
“`[`” module_predicate_indicator_alias_sequence “`]`”
module_non_terminal_indicator_alias ::=
non_terminal_indicator |
non_terminal_indicator “`as`” non_terminal_indicator
non_terminal_indicator “`:`” non_terminal_indicator
module_non_terminal_indicator_alias_sequence ::=
module_non_terminal_indicator_alias |
module_non_terminal_indicator_alias “`,`” module_non_terminal_indicator_alias_sequence
module_non_terminal_indicator_alias_list ::=
“`[`” module_non_terminal_indicator_alias_sequence “`]`”
non_terminal_indicator_term ::=
non_terminal_indicator |
non_terminal_indicator_sequence |
non_terminal_indicator_list
non_terminal_indicator_sequence ::=
non_terminal_indicator |
non_terminal_indicator “`,`” non_terminal_indicator_sequence
non_terminal_indicator_list ::=
“`[`” non_terminal_indicator_sequence “`]`”
non_terminal_indicator ::=
functor “`//`” arity
qualified_non_terminal_indicator_term ::=
qualified_non_terminal_indicator |
qualified_non_terminal_indicator_sequence |
qualified_non_terminal_indicator_list
qualified_non_terminal_indicator_sequence ::=
qualified_non_terminal_indicator |
qualified_non_terminal_indicator “`,` ” qualified_non_terminal_indicator_sequence
qualified_non_terminal_indicator_list ::=
“`[`” qualified_non_terminal_indicator_sequence “`]`”
qualified_non_terminal_indicator ::=
non_terminal_indicator |
object_identifier “`::`” non_terminal_indicator |
category_identifier “`::`” non_terminal_indicator |
module_identifier “`:`” non_terminal_indicator
non_terminal_indicator_alias ::=
non_terminal_indicator |
non_terminal_indicator “`as`” non_terminal_indicator
non_terminal_indicator “`::`” non_terminal_indicator
non_terminal_indicator_alias_sequence ::=
non_terminal_indicator_alias |
non_terminal_indicator_alias “`,`”
non_terminal_indicator_alias_sequence
non_terminal_indicator_alias_list ::=
“`[`” non_terminal_indicator_alias_sequence “`]`”
operator_sequence ::=
operator specification |
operator specification “`,`”
operator_sequence
operator_list ::=
“`[`” operator_sequence “`]`”
coinductive_predicate_template_term ::=
coinductive_predicate_template |
coinductive_predicate_template_sequence |
coinductive_predicate_template_list
coinductive_predicate_template_sequence ::=
coinductive_predicate_template |
coinductive_predicate_template “`,`”
coinductive_predicate_template_sequence
coinductive_predicate_template_list ::=
“`[`” coinductive_predicate_template_sequence “`]`”
coinductive_predicate_template ::=
atom “`(`” coinductive_mode_terms “`)`”
coinductive_mode_terms ::=
coinductive_mode_term |
coinductive_mode_terms “`,`” coinductive_mode_terms
coinductive_mode_term ::=
“`+`” | “`-`”
predicate_mode_term ::=
atom “`(`” mode_terms “`)`”
non_terminal_mode_term ::=
atom “`(`” mode_terms “`)`”
mode_terms ::=
mode_term |
mode_term “`,`” mode_terms
mode_term ::=
“`@`” [ type ] | “`+`” [ type ] | “`-`” [ type ] | “`?`” [
type ] |
“`++`” [ type ] | “`--`” [ type ]
type ::=
prolog_type | logtalk_type | user_defined_type
prolog_type ::=
“`term`” | “`nonvar`” | “`var`” |
“`compound`” | “`ground`” | “`callable`” | “`list`” |
“`atomic`” | “`atom`” |
“`number`” | “`integer`” | “`float`”
logtalk_type ::=
“`object`” | “`category`” | “`protocol`” |
“`event`”
user_defined_type ::=
atom |
compound
number_of_proofs ::=
“`zero`” | “`zero_or_one`” | “`zero_or_more`” | “`one`” |
“`one_or_more`” | “`zero_or_error`” | “`one_or_error`” |
“`zero_or_one_or_error`” | “`error`”
meta_predicate_template_term ::=
meta_predicate_template |
meta_predicate_template_sequence |
meta_predicate_template_list
meta_predicate_template_sequence ::=
meta_predicate_template |
meta_predicate_template “`,`” meta_predicate_template_sequence
meta_predicate_template_list ::=
“`[`” meta_predicate_template_sequence “`]`”
meta_predicate_template ::=
object_identifier “`::`” atom “`(`” meta_predicate_specifiers “`)`” |
category_identifier “`::`” atom “`(`” meta_predicate_specifiers “`)`” |
atom “`(`” meta_predicate_specifiers “`)`”
meta_predicate_specifiers ::=
meta_predicate_specifier |
meta_predicate_specifier “`,`” meta_predicate_specifiers
meta_predicate_specifier ::=
non-negative integer | “`::`” | “`^`” |
“`*`”
meta_non_terminal_template_term ::=
meta_predicate_template_term
entity_info_list ::=
“`[]`” |
“`[`” entity_info_item “`is`” nonvar “`|`” entity_info_list
“`]`”
entity_info_item ::=
“`comment`” | “`remarks`” |
“`author`” | “`version`” | “`date`” |
“`copyright`” | “`license`” |
“`parameters`” | “`parnames`” |
“`see_also`” |
atom
predicate_info_list ::=
“`[]`” |
“`[`” predicate_info_item “`is`” nonvar “`|`” predicate_info_list “`]`”
predicate_info_item ::=
“`comment`” | “`remarks`” |
“`arguments`” | “`argnames`” |
“`redefinition`” | “`allocation`” |
“`examples`” | “`exceptions`” |
atom
object_alias ::=
object_identifier “`as`” object_identifier
object_alias_sequence ::=
object_alias |
object_alias “`,`” object_alias_sequence
object_alias_list ::=
“`[`” object_alias_sequence “`]`”

## Clauses and goals

clause ::=
object_identifier “`::`” head “`:-`” body |
module_identifier “`:`” head “`:-`” body |
head :- body |
fact
goal ::=
message_sending |
super_call |
external_call |
context_switching_call |
callable
message_sending ::=
message_to_object |
message_delegation |
message_to_self
message_to_object ::=
receiver “`::`” messages
message_delegation ::=
“`[`” message_to_object “`]`”
message_to_self ::=
“`::`” messages
super_call ::=
“`^^`” message
messages ::=
message |
“`(`” message “`,`” messages “`)`” |
“`(`” message “`;`” messages “`)`” |
“`(`” message “`->`” messages “`)`”
message ::=
callable |
variable
receiver ::=
“`{`” callable “`}`” |
object_identifier |
variable
external_call ::=
“`{`” callable “`}`”
context_switching_call ::=
object_identifier “`<<`” goal

## Lambda expressions

lambda_expression ::=
lambda_free_variables “`/`” lambda_parameters “`>>`” callable |
lambda_free_variables “`/`” callable |
lambda_parameters “`>>`” callable
lambda_free_variables ::=
“`{`” conjunction of variables “`}`” |
“`{`” variable “`}`” |
“`{}`”
lambda_parameters ::=
list of terms |
“`[]`”

## Entity properties

category_property ::=
“`static`” |
“`dynamic`” |
“`built_in`” |
“`file(`” atom “`)`” |
“`file(`” atom “`,`” atom “`)`” |
“`lines(`” integer “`,`” integer “`)`” |
“`events`” |
“`source_data`” |
“`public(`” entity_resources_list “`)`” |
“`protected(`” entity_resources_list “`)`” |
“`private(`” entity_resources_list “`)`” |
“`declares(`” predicate_indicator “`,`” predicate_declaration_property_list “`)`” |
“`defines(`” predicate_indicator “`,`” predicate_definition_property_list “`)`” |
“`includes(`” predicate_indicator “`,`” object_identifier | category_identifier “`,`” predicate_definition_property_list “`)`” |
“`provides(`” predicate_indicator “`,`” object_identifier | category_identifier “`,`” predicate_definition_property_list “`)`” |
“`alias(`” predicate_indicator “`,`” predicate_alias_property_list “`)`” |
“`calls(`” predicate “`,`” predicate_call_update_property_list “`)`” |
“`updates(`” predicate “`,`” predicate_call_update_property_list “`)`” |
“`number_of_clauses(`” integer “`)`” |
“`number_of_rules(`” integer “`)`” |
“`number_of_user_clauses(`” integer “`)`” |
“`number_of_user_rules(`” integer “`)`” |
“`debugging`”
object_property ::=
“`static`” |
“`dynamic`” |
“`built_in`” |
“`threaded`” |
“`file(`” atom “`)`” |
“`file(`” atom “`,`” atom “`)`” |
“`lines(`” integer “`,`” integer “`)`” |
“`context_switching_calls`” |
“`dynamic_declarations`” |
“`events`” |
“`source_data`” |
“`complements(`” “`allow`” | “`restrict`” “`)`” |
“`complements`” |
“`public(`” entity_resources_list “`)`” |
“`protected(`” entity_resources_list “`)`” |
“`private(`” entity_resources_list “`)`” |
“`declares(`” predicate_indicator “`,`” predicate_declaration_property_list “`)`” |
“`defines(`” predicate_indicator “`,`” predicate_definition_property_list “`)`” |
“`includes(`” predicate_indicator “`,`” object_identifier | category_identifier “`,`” predicate_definition_property_list “`)`” |
“`provides(`” predicate_indicator “`,`” object_identifier | category_identifier “`,`” predicate_definition_property_list “`)`”
“`alias(`” predicate_indicator “`,`” predicate_alias_property_list “`)`” |
“`calls(`” predicate “`,`” predicate_call_update_property_list “`)`” |
“`updates(`” predicate “`,`” predicate_call_update_property_list “`)`” |
“`number_of_clauses(`” integer “`)`” |
“`number_of_rules(`” integer “`)`” |
“`number_of_user_clauses(`” integer “`)`”
“`number_of_user_rules(`” integer “`)`” |
“`module` |”
“`debugging`”
protocol_property ::=
“`static`” |
“`dynamic`” |
“`built_in`” |
“`source_data`” |
“`file(`” atom “`)`” |
“`file(`” atom “`,`” atom “`)`” |
“`lines(`” integer “`,`” integer “`)`” |
“`public(`” entity_resources_list “`)`” |
“`protected(`” entity_resources_list “`)`” |
“`private(`” entity_resources_list “`)`” |
“`declares(`” predicate_indicator “`,`” predicate_declaration_property_list “`)`” |
“`alias(`” predicate_indicator “`,`” predicate_alias_property_list “`)`” |
“`debugging`”
predicate_declaration_property_list ::=
“`[`” predicate_declaration_property_sequence “`]`”
predicate_declaration_property_sequence ::=
predicate_declaration_property |
predicate_declaration_property “`,`”
predicate_declaration_property_sequence
predicate_declaration_property ::=
“`static`” | “`dynamic`” |
“`scope(`” scope “`)`” |
“`private`” | “`protected`” | “`public`” |
“`coinductive`” |
“`multifile`” |
“`synchronized`” |
“`meta_predicate(`” meta_predicate_template “`)`” |
“`coinductive(`” coinductive_predicate_template “`)`” |
“`non_terminal(`” non_terminal_indicator “`)`” |
“`include(`” atom “`)`” |
“`line_count(`” integer “`)`” |
“`mode(`” predicate_mode_term | non_terminal_mode_term “`,`” number_of_proofs “`)`” |
“`info(`” list “`)`”
predicate_definition_property_list ::=
“`[`” predicate_definition_property_sequence “`]`”
predicate_definition_property_sequence ::=
predicate_definition_property |
predicate_definition_property “`,`”
predicate_definition_property_sequence
predicate_definition_property ::=
“`inline`” | “`auxiliary`” |
“`non_terminal(`” non_terminal_indicator “`)`” |
“`include(`” atom “`)`” |
“`line_count(`” integer “`)`” |
“`number_of_clauses(`” integer “`)`” |
“`number_of_rules(`” integer “`)`”
predicate_alias_property_list ::=
“`[`” predicate_alias_property_sequence “`]`”
predicate_alias_property_sequence ::=
predicate_alias_property |
predicate_alias_property “`,`” predicate_alias_property_sequence
predicate_alias_property ::=
“`for(`” predicate_indicator “`)`” |
“`from(`” entity_identifier “`)`” |
“`non_terminal(`” non_terminal_indicator “`)`” |
“`include(`” atom “`)`” |
“`line_count(`” integer “`)`”
predicate ::=
predicate_indicator |
“`^^`” predicate_indicator |
“`::`” predicate_indicator |
variable “`::`” predicate_indicator |
object_identifier “`::`” predicate_indicator |
variable “`:`” predicate_indicator |
module_identifier “`:`” predicate_indicator
predicate_call_update_property_list ::=
“`[`” predicate_call_update_property_sequence “`]`”
predicate_call_update_property_sequence ::=
predicate_call_update_property |
predicate_call_update_property “`,`”
predicate_call_update_property_sequence
predicate_call_update_property ::=
“`caller(`” predicate_indicator “`)`” |
“`include(`” atom “`)`” |
“`line_count(`” integer “`)`” |
“`as(`” predicate_indicator “`)`”

## Predicate properties

predicate_property ::=
“`static`” | “`dynamic`” |
“`scope(`” scope “`)`” |
“`private`” | “`protected`” | “`public`” |
“`logtalk`” | “`prolog`” | “`foreign`” |
“`coinductive(`” coinductive_predicate_template “`)`” |
“`multifile`” |
“`synchronized`” |
“`built_in`” |
“`inline`” |
“`declared_in(`” entity_identifier “`)`” |
“`defined_in(`” object_identifier | category_identifier “`)`” |
“`redefined_from(`” object_identifier | category_identifier “`)`” |
“`meta_predicate(`” meta_predicate_template “`)`” |
“`alias_of(`” callable “`)`” |
“`alias_declared_in(`” entity_identifier “`)`” |
“`non_terminal(`” non_terminal_indicator “`)`” |
“`mode(`” predicate_mode_term | non_terminal_mode_term “`,`” number_of_proofs “`)`” |
“`info(`” list “`)`” |
“`number_of_clauses(`” integer “`)`” |
“`number_of_rules(`” integer “`)`” |
“`declared_in(`” entity_identifier “`,`” line_count “`)`” |
“`defined_in(`” object_identifier | category_identifier “`,`” line_count “`)`” |
“`redefined_from(`” object_identifier | category_identifier “`,`” line_count “`)`” |
“`alias_declared_in(`” entity_identifier “`,`” line_count “`)`”
line_count ::=
integer”

## Compiler flags

compiler_flag ::=
flag(flag_value)