This part of ISO 24610 provides a format to represent, store or exchange feature structures in natural language applications, for both annotation and production of linguistic data. It is ultimately designed to provide a computer format to define a type hierarchy and to declare the constraints that bear on a set of feature specifications and operations on feature structures, thus offering means to check the conformance of each feature structure with regards to a reference specification. Feature structures are an essential part of many linguistic formalisms as well as an underlying mechanism for representing the information consumed or produced by and for language engineering applications.<\/p>\n
A feature system declaration (FSD) is an auxiliary file used in conjunction with a certain type of text that makes use of fs (that is, feature structure) elements. The FSD serves four purposes.<\/p>\n
It provides an encoding by which types and their subtyping and inheritance relationships can be introduced and defined, thus laying the basis for constructing a feature system.<\/p>\n<\/li>\n
It provides a mechanism by which the encoder can list all of the feature names and feature values and give a prose description as to what each represents.<\/p>\n<\/li>\n
It provides a mechanism by which type constraints can be declared, against which typed feature structures are validated relative to a given theory stated in typed feature logic. These constraints may involve constraints on the range of a feature’s value, constraints on which features are permitted within certain types of feature structures, or constraints that prevent the co-occurrence of certain feature-value pairs. The source of these constraints is normally the empirical domain being modelled.<\/p>\n<\/li>\n
It provides a mechanism by which the encoder can define the intended interpretation of underspecified feature structures. This involves defining default values (whether literal or computed) for missing features.<\/p>\n<\/li>\n<\/ul>\n
The scheme described in this part of ISO 24610 may be used to document any feature system, but is primarily intended for use with the typed feature structure representation defined in ISO 24610-1. The feature structure representations of ISO 24610-1 specify data structures that are subject to the typing conventions and constraints specified using ISO 24610-2. The feature structure representations of ISO 24610-1 are also used within some of the elements defined in ISO 24610-2.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 9<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4 Overall structure <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5 Basic concepts 5.1 Typed feature structures reviewed <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2 Types 5.2.1 Atomic types 5.2.2 Complex types <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.2.3 Collections <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2.4 Operators 5.3 Type inheritance hierarchies <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.4 Type constraints <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 5.5 Optional (default) values and underspecification 5.6 Subsumption <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 6 Defining well-formedness versus validity 6.1 Overview 6.1.1 General 6.1.2 Formal logics 6.1.3 XML 6.2 ISO\u00a024610 6.2.1 Definitions <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 6.2.2 Review of the syntax of typed feature structures in XML 6.2.2.1 Overview 6.2.2.2 Introducing names <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 6.2.2.3 Basic pattern 6.2.2.4 Feature value patterns <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 6.2.3 Illustrations for well-formedness 6.2.4 Illustration for validity 6.2.4.1 Conditions <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 6.2.4.2 Illustration for validity 6.2.4.3 Overall constraint for the type word <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7 A feature system for a grammar 7.1 Overview <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 7.2 Sample FSDs 7.2.1 General 7.2.2 Defining types and their hierarchy 7.2.3 Declaring type constraints <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | 8 Declaration of a feature system <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | 8.1 Overview 8.2 Linking a text to feature system declarations <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | 8.3 Overall structure of a feature system declaration <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | 8.4 Feature declarations 8.4.1 General 8.4.2 Type inference for obligatory features <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | 8.4.3 Type inference for optional features with defaults 8.4.4 Type inference for optional features without defaults 8.4.5 Possibility of failed inference 8.4.6 Elements and attributes of feature declarations <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 8.4.7 Feature declarations and subsumption 8.4.8 Example of feature declarations <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | 8.5 Feature structure constraints <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Language resource management. Feature structures – Feature system declaration<\/b><\/p>\n |