Feature Identifiers

Feature identifiers are used by the @features meta-value (see Meta Values and Commands) to specify which features are enabled in a document. They can also be used programmatically to customize a parser, for example, to enable or disable specific features.

Feature Groups

Feature groups allow you to specify a predefined set of features in a compact way. Refer to Parser Tiers for more details about the different parser tiers.

Identifier	Tier	Description
core	—	Core Language: All core language features.
minimum	M	Minimum Features: Includes the minimum required features: float, byte-count.
standard	S	Standard Features: Includes all minimum and standard features: float, byte-count, multi-line, section-list, value-list, text-names, date-time, code, byte-data, include.
advanced	A	Advanced Features: Includes all minimum, standard, and advanced features: float, byte-count, multi-line, section-list, value-list, text-names, date-time, code, byte-data, include, regex, time-delta.
all	—	All Features: Includes all features supported by the current language version.

Individual Language Features

The table below lists the individual language features along with their corresponding tier:

Identifier	Tier	Description
float	M	Floating-Point Numbers: Support for floating point numbers.
byte-count	M	Byte Counts: Support for byte count suffixes in decimal integers.
multi-line	S	Multi-line Values: Support for multi-line values.
section-list	S	Section Lists: Support for section lists.
value-list	S	Value Lists: Support for value lists.
text-names	S	Text Names: Support for text names.
date-time	S	Date-Time Values: Support for date, time, and date-time values.
code	S	Code Values: Support for code text values.
byte-data	S	Byte-Data Values: Support for hexadecimal-formatted byte-data.
include	S	Include Commands: Support for the include meta command.
regex	A	Regular Expression Values: Support for regular expressions.
time-delta	A	Time-Delta Values: Support for time-delta values.

Parser Features

Parser features are not meant to be specified in a @features meta value. They exist to describe advanced capabilities of a parser.

Identifier	Description
validation	Validation Rules Support: Provides support for validation rules.
signature	Signature Support: Provides support for document signatures.

Available Data

The data directory contains the file features.json, which defines all error categories in a machine-readable format.