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BS ISO 24610-2:2011:2013 Edition

BS ISO 24610-2:2011:2013 Edition

$198.66

Language resource management. Feature structures – Feature system declaration

Published By Publication Date Number of Pages
BSI 2013 62
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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.

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.

  • 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.

  • 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.

  • 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.

  • 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.

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.

PDF Catalog

PDF Pages PDF Title
9 1 Scope
2 Normative references
10 3 Terms and definitions
13 4 Overall structure
14 5 Basic concepts
5.1 Typed feature structures reviewed
15 5.2 Types
5.2.1 Atomic types
5.2.2 Complex types
16 5.2.3 Collections
17 5.2.4 Operators
5.3 Type inheritance hierarchies
19 5.4 Type constraints
20 5.5 Optional (default) values and underspecification
5.6 Subsumption
22 6 Defining well-formedness versus validity
6.1 Overview
6.1.1 General
6.1.2 Formal logics
6.1.3 XML
6.2 ISOĀ 24610
6.2.1 Definitions
23 6.2.2 Review of the syntax of typed feature structures in XML
6.2.2.1 Overview
6.2.2.2 Introducing names
24 6.2.2.3 Basic pattern
6.2.2.4 Feature value patterns
25 6.2.3 Illustrations for well-formedness
6.2.4 Illustration for validity
6.2.4.1 Conditions
26 6.2.4.2 Illustration for validity
6.2.4.3 Overall constraint for the type word
27 7 A feature system for a grammar
7.1 Overview
28 7.2 Sample FSDs
7.2.1 General
7.2.2 Defining types and their hierarchy
7.2.3 Declaring type constraints
31 8 Declaration of a feature system
32 8.1 Overview
8.2 Linking a text to feature system declarations
33 8.3 Overall structure of a feature system declaration
35 8.4 Feature declarations
8.4.1 General
8.4.2 Type inference for obligatory features
36 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
37 8.4.7 Feature declarations and subsumption
8.4.8 Example of feature declarations
41 8.5 Feature structure constraints

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BS ISO 24610-2:2011
$198.66