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Java API for Natural Language Generation

There is a newer version: 4.5.0

/*
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is "Simplenlg".
 *
 * The Initial Developer of the Original Code is Ehud Reiter, Albert Gatt and Dave Westwater.
 * Portions created by Ehud Reiter, Albert Gatt and Dave Westwater are Copyright (C) 2010-11 The University of Aberdeen. All Rights Reserved.
 *
 * Contributor(s): Ehud Reiter, Albert Gatt, Dave Wewstwater, Roman Kutlak, Margaret Mitchell.
 */

package simplenlg.features;

/**
 * 
 * This class defines a list of features which can be set up users of SimpleNLG.
 * Note that there are three feature classes in SimpleNLG.
 * 

 *  Feature: features typically set up developers invoking
 * SimpleNLG
 * 
 LexicalFeature: features typically set up the SimpleNLG
 * lexicon
 * 
 InternalFeature: features typically used internally by
 * SimpleNLG
 * 
 * 
 * Elements in the system can, in theory, take any kind of feature. Some
 * features will only be expected by certain processors, however. Developers can
 * define their own features but should choose names that do not conflict with
 * those presented here.
 * 
 * 
 * The details for each feature are supplied in a table. The entries are:
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * 
 * Feature name This is the name that will appear in the element's feature list as
 * produced by the toString() method or by calling
 * getAllFeatureNames
Expected type As features are represented as a Map connecting a
 * String and an Object then, in theory, a feature can
 * take any object as a value. This table entry defines the type that the
 * SimpleNLG system expects.
Created by Defines where the feature is created. In addition, all features can be
 * added specifically by users
Used by Defines which processors use the feature.
Applies to Defines which structural, syntactical or lexical elements this feature is
 * applied to.
Default Any default values attributed to the feature are given here.

 * 
 * @author E. Reiter and D. Westwater, University of Aberdeen.
 * @version 4.0
 * 
 */

@SuppressWarnings("nls")
abstract public class Feature {

	/**
	 * The constructor is never needed.
	 */
	private Feature() {
		// do nothing
	}

	/**
	 * 
	 * This feature determines if the adjectives should be reordered. Some
	 * lexicons might support the positioning of adjectives and by default, this
	 * order will be used. The user can override the ordering of adjectives by
	 * setting this feature to false.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name adjectiveOrdering
Expected type Boolean
Created by Set by the phrase factory on noun phrases. It can be overwritten by
	 * the user.
Used by The syntax processor will reorder adjectives in the premodifiers list
	 * if this feature has a value of true.
Applies to Noun phrases only.
Default Boolean.TRUE
	 */
	public static final String ADJECTIVE_ORDERING = "adjective_ordering";

	/**
	 * 
	 * This feature determines if the auxiliary verbs in a clause should be
	 * aggregated.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name aggregateAuxiliary
Expected type Boolean
Created by Needs to be manually set by user.
Used by The syntax processor will remove the auxiliary verbs from clauses
	 * when this is set to true.
Applies to Clauses only.
Default Boolean.FALSE
	 */
	public static final String AGGREGATE_AUXILIARY = "aggregate_auxiliary";

	/**
	 * 
	 * The complementiser is the word that joins a subordinate clause to the
	 * parent clause. For example, the two clauses: Timmy sang a song
	 * and moved Elizabeth to tears can be joined with the
	 * complementiser that to form:
	 * Timmy sang a song that moved Elizabeth to
	 * tears.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name complementiser
Expected type Can take any NLGElement or a string. It is recommended
	 * to use
	 * InflectedWordElement as created by the PhraseFactory
	 * method createWord(...).
Created by The default is created by the PhraseFactory when creating 
	 * clauses.
Used by The syntax processor uses the value of this feature when adding
	 * complements to subordinate clauses.
Applies to Clauses only.
Default "that" represented by an InflectedWordElement if a
	 * lexicon is used, otherwise a StringElement.
	 */
	public static final String COMPLEMENTISER = "complementiser";

	/**
	 * 
	 * This feature represents the word (or phrase) used for linking coordinated
	 * phrases together.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name conjunction
Expected type A String.
Created by CoordinatedPhraseElement creates this feature
	 * automatically. The user can overwrite the value.
Used by The syntax processor constructs the correct syntax for the
	 * coordinated phrases.
Applies to CoordinatedPhraseElements.
Default null
	 */
	public static final String CONJUNCTION = "conjunction";

	/**
	 * 
	 * This feature represents the type of conjunction this coordination
	 * represents.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name conjunctionType
Expected type ConjunctionType
Created by CoordinatedPhraseElement sets this value automatically.
	 * It can be overwritten by the user.
Used by The syntax processor constructs the correct syntax for the
	 * coordinated phrases.
Applies to CoordinatedPhraseElements.
Default ConjunctionType.COORDINATING
	 */
	public static final String CONJUNCTION_TYPE = "conjunction_type";

	/**
	 * 
	 * An appositive is a type of postmodifying phrase which is quasi-synonymous
	 * with, or a possible replacement of, the phrase it modifies. A typical
	 * example occurs with NPs, e.g.:
	 * his house, a large villa, is on the hill where the phrase
	 * a large villa is an appositive postmodifier of
	 * his house. Note that appositives are usually realised surrounded
	 * by commas. Accordingly, this feature is primarily used by the orthography
	 * processor to determine whether commas should be placed around a
	 * postmodifying phrase.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name appositive
Expected type boolean
Created by The user.
Used by The orthography processor to determine comma placement.
Applies to Any phrase which is a postmodifier of another phrase.
Default false or null
	 */
	public static final String APPOSITIVE = "appositive";

	/**
	 * 
	 * This feature represents the cue phrase of a sentence. Cue phrases
	 * sometimes appear at the start of sentences. In the following example,
	 * however forms the cue phrase:

	 * However, John 
	 * played football instead.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name cuePhrase
Expected type NLGElement
Created by Cue phrases need to be specifically added by the user.
Used by The syntax processor places the cue phrase at the start of a
	 * sentence.
Applies to Sentences.
Default null
	 */
	public static final String CUE_PHRASE = "cue_phrase";

	/**
	 * 
	 * This features determines if the phrase is elided. Elided phrases are
	 * omitted from the final realisation.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isElided
Expected type Boolean
Created by The feature needs to be set by the user.
Used by The syntax processor removes elided phrases.
Applies to Noun phrases only.
Default Boolean.FALSE
	 */
	public static final String ELIDED = "elided";

	/**
	 * 
	 * This feature dictates the form that a verb takes.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
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	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name form
Expected type Form
Created by Initially created by the phrase factory when constructing verb
	 * phrases. The user is free to set the value accordingly.
Used by The syntax processor set the form on sentences to be the same as that
	 * from the containing verb phrase. The syntax processor will also check a
	 * verb's form for the addition of supporting words such as will
	 * and to. The morphology processor uses the form to determine the
	 * actual inflection of the verb to be used.
Applies to Nouns, verbs noun phrases and verb phrases.
Default Form.NORMAL
	 */
	public static final String FORM = "form";

	/**
	 * 
	 * This feature determines the type of interrogative (question) used for the
	 * clause.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name interrogativeType
Expected type InterrogativeType
Created by The user must set this value.
Used by The syntax processor uses this feature to correctly structure
	 * interrogative clauses.
Applies to Clauses only.
Default null.
	 */
	public static final String INTERROGATIVE_TYPE = "interrogative_type";

	/**
	 * 
	 * This flag determines if the Adjective or Adverb should be inflected into
	 * the comparative form. For example, the comparative form for
	 * early is earlier, the comparative form of big
	 * is bigger.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isComparative
Expected type Boolean
Created by The user.
Used by The morphology processor to correctly inflect the word.
Applies to Adjectives and adverbs only
Default Boolean.FALSE.
	 */
	public static final String IS_COMPARATIVE = "is_comparative";

	/**
	 * 
	 * This flag determines if the Adjective or Adverb should be inflected into
	 * the superlative form. For example, the comparative form for
	 * early is earliest, the superlative form of big
	 * is biggest.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isSuperlative
Expected type Boolean
Created by The user.
Used by The morphology processor to correctly inflect the word.
Applies to Adjectives and adverbs only
Default Boolean.FALSE.
	 */
	public static final String IS_SUPERLATIVE = "is_superlative";

	/**
	 * 
	 * The modal represents the modal auxiliary verb that is used in a verb
	 * phrase to express mood or tense. The English modals are: can,
	 * may, must, ought, shall,
	 * should, will and would.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name modal
Expected type String
Created by The user.
Used by The syntax processor adds modals into the structure.
Applies to Clauses, coordinated phrases and verb phrases. In the case of clauses
	 * and coordinated phrases, the modal is passed on to the underlying verb
	 * phrase.
Default null.
	 */
	public static final String MODAL = "modal";

	/**
	 * 
	 * The flag determines if the corresponding verb phrase should be negated.
	 * For example, negating the clause John kissed Mary results in the
	 * clause John did not kiss Mary.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isNegated
Expected type Boolean
Created by The user.
Used by The syntax processor, which will correctly add in all necessary
	 * auxiliary verbs.
Applies to Clauses, coordinated phrases and verb phrases. In the case of clauses
	 * and coordinated phrases, the modal is passed on to the underlying verb
	 * phrase. Applying negation to a coordinated phase will negate all the
	 * coordinates.
Default Boolean.FALSE.
	 */
	public static final String NEGATED = "negated";

	/**
	 * 
	 * This feature is used to determine if the element is to be represented in
	 * singular or plural form.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name number
Expected type NumberAgreement
Created by The phrase factory will create the number in certain cases, mostly in
	 * dealing with pronouns. However, with supporting lexicons a word such as
	 * dogs will be correctly identified as the plural form of
	 * dog. The user can also set this feature.
Used by The syntax processor ensures number agreement across phrases and
	 * clauses, while the morphology processor uses the feature to pluralise
	 * words.
Applies to Clauses, coordinated phrases, noun phrases and verb phrases.
Default NumberAgreement.SINGULAR.
	 */
	public static final String NUMBER = "number";

	/*
	 *  This feature represents the pattern that a particular word follows
	 * when being inflected. These can be regular, irregular,
	 * regular double and in the case of nouns, Greco-Latin
	 * regular.  
	 * 
	 * 
	 * 
	 * 
	 * 
	 *   Feature name pattern  
  Expected type Pattern  
  Created by The user.  
  Used by  The morphology
	 * processor uses this feature to correctly inflect words following a simple
	 * set of rules when no lexicon or user-defined form is supplied.  
 Applies to  Adjectives, nouns and verbs.
  Default  null.  
	 */
	// public static final String PATTERN = "pattern";

	/**
	 * 
	 * This feature represents a particle used in conjunction with a verb. For
	 * example, the verb phrases fall down and look up have
	 * particles of down and up respectively.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name particle
Expected type String or NLGElement
Created by The phrase factory will automatically check verbs to see if they
	 * contain more than one word. In such a case, the first word becomes the
	 * verb while additional words form the particle. The user can also
	 * explicitly specify a particle
Used by The syntax processor adds particles into the structure.
Applies to Verb phrases only.
Default null.
	 */
	public static final String PARTICLE = "particle";

	/**
	 * 
	 * This flag shows if the phrase or clause should be written in the passive
	 * form. For example, the clause the cat ate the mouse can be
	 * written in the passive form as the mouse was eaten by the cat.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isPassive
Expected type Boolean
Created by User defined.
Used by The syntax processor uses the passive feature to determine the
	 * correct ordering of subjects and objects in a clause. It also adds in
	 * additional auxiliary verbs to verb phrases, such as was in the
	 * above example. The morphology processor will change pronouns of noun
	 * phrases into passive form.
Applies to Clauses, noun phrases and verb phrases.
Default Boolean.FALSE.
	 */
	public static final String PASSIVE = "passive";

	/**
	 * 
	 * This flag shows if the phrase or clause should be written in the perfect
	 * form. The perfect aspect is normally formed from the auxiliary verb
	 * to have followed by the past participle of the main verb. For
	 * example, the phrase the cat eats the mouse would have the
	 * present perfect form of the cat has eaten the mouse.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isPerfect
Expected type Boolean
Created by User defined.
Used by The syntax processor adds in additional auxiliary verbs to verb
	 * phrases, and alters the form of the main verb.
Applies to Verbs and verb phrases.
Default Boolean.FALSE.
	 */
	public static final String PERFECT = "perfect";

	/**
	 * 
	 * This feature represents the first-person, second-person or third-person
	 * nature of the phrase. This predominantly affects pronouns such as
	 * I, you and they but some verbs will also be
	 * modified depending on the person of reference. For example, kiss is used
	 * as the present tense for first and second person (I kiss Mary
	 * and you kiss Mary) while kisses is used for third person (
	 * he kisses Mary).
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name person
Expected type Person
Created by Will be set automatically by the phrase factory when personal
	 * pronouns are identified. May also be set by the user.
Used by The syntax processor does some basic checking on the person-nature of
	 * phrases while the morphology processor will correctly inflect pronouns
	 * and verbs.
Applies to Clauses, coordinated phrases, noun phrases and verb phrases.
Default Person.THIRD.
	 */
	public static final String PERSON = "person";

	/**
	 * 
	 * This flag shows if the noun phrase should be written in the possessive
	 * form. The possessive form of a noun is usually formed from the noun with
	 * 's added to the end. For example, dog has a possessive form dog's
	 * . Certain personal pronouns follow different rules, the possessive form
	 * of I is mine, you is yours.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isPossessive
Expected type Boolean
Created by User defined.
Used by The syntax processor correctly defines the possessive on noun phrases
	 * that contain more than one subject (we say John and Mary's not John's and Mary's
	 * ). The morphology processor correctly inflects the possessive forms of
	 * nouns and pronouns.
Applies to Clauses, coordinated phrases and noun phrases.
Default Boolean.FALSE in most cases or for pronouns it is
	 * dependent on the pronoun form used.
	 */
	public static final String POSSESSIVE = "possessive";

	/**
	 * 
	 * This flag can be set for noun phrases where it is desirable to overwrite
	 * the subject with a suitable pronoun.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isPronominal
Expected type Boolean
Created by User defined.
Used by The syntax processor will replace the subject of a noun phrase with a
	 * suitable personal pronoun.
Applies to Noun phrases only.
Default Boolean.FALSE.
	 */
	public static final String PRONOMINAL = "pronominal";

	/**
	 * 
	 * This flag determines if the verb phrase should be constructed in the
	 * progressive form. For example, the progressive form of John kisses 
	 * Mary is John is kissing Mary.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name progressive
Expected type Boolean
Created by Set by the user.
Used by The syntax processor adds in required auxiliary verbs when dealing
	 * with the progressive form.
Applies to Clauses, coordinated phrases and verb phrases only.
Default Boolean.FALSE.
	 */
	public static final String PROGRESSIVE = "progressive";

	/**
	 * 
	 * This flag can be set when specifiers in a coordinated phrase should be
	 * raised. For example, the coordinated phrase my cat and my dog
	 * can have its specifiers raised becoming my cat and dog.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name raiseSpecifier
Expected type Boolean
Created by User defined.
Used by The syntax processor to correctly add or remove specifiers.
Applies to Coordinated phrases only.
Default Boolean.FALSE
	 */
	public static final String RAISE_SPECIFIER = "raise_specifier";

	/**
	 * 
	 * This flag is set when it is necessary to suppress the genitive when
	 * dealing with gerund forms.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name suppressGenitive
Expected type Boolean
Created by The user.
Used by The syntax processor will set subjects to be possessive when dealing
	 * with the gerund form unless this flag is set.
Applies to Clauses only.
Default Boolean.FALSE
	 */
	public static final String SUPPRESS_GENITIVE_IN_GERUND = "suppress_genitive_in_gerund";

	/**
	 * 
	 * This flag determines if complementisers in subordinating clauses should
	 * be suppressed.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name isSuppressedComplementiser
Expected type Boolean
Created by The phrase factory sets some defaults but can be overridden by the
	 * user.
Used by The syntax processor will ignore suppressed complementisers on
	 * subordinating clauses.
Applies to Clauses and coordinated phrases.
Default Boolean.FALSE for clauses or Boolean.TRUE
	 * on clauses when added to a coordinated phrase.
	 */
	public static final String SUPRESSED_COMPLEMENTISER = "suppressed_complementiser";

	/**
	 * 
	 * This flag represents the tense or temporal quality of a verb.
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * 
	 * Feature name tense
Expected type Tense
Created by The user.
Used by The syntax processor ensures tense on phrases, clauses and
	 * coordinated phrases is passed on to the underlying verb phrases. The
	 * morphology processor uses the tese to correctly inflect verbs.
Applies to Clauses, coordinated phrases and verb phrases.
Default Tense.PRESENT.
	 */
	public static final String TENSE = "tense";
}

Feature name	This is the name that will appear in the element's feature list as * produced by the `toString()` method or by calling * `getAllFeatureNames`
Expected type	As features are represented as a `Map` connecting a * `String` and an `Object` then, in theory, a feature can * take any object as a value. This table entry defines the type that the * SimpleNLG system expects.
Created by	Defines where the feature is created. In addition, all features can be * added specifically by users
Used by	Defines which processors use the feature.
Applies to	Defines which structural, syntactical or lexical elements this feature is * applied to.
Default	Any default values attributed to the feature are given here.

Feature name	adjectiveOrdering
Expected type	`Boolean`
Created by	Set by the phrase factory on noun phrases. It can be overwritten by * the user.
Used by	The syntax processor will reorder adjectives in the premodifiers list * if this feature has a value of `true`.
Applies to	Noun phrases only.
Default	`Boolean.TRUE`

Feature name	aggregateAuxiliary
Expected type	`Boolean`
Created by	Needs to be manually set by user.
Used by	The syntax processor will remove the auxiliary verbs from clauses * when this is set to `true`.
Applies to	Clauses only.
Default	`Boolean.FALSE`

Feature name	complementiser
Expected type	Can take any `NLGElement` or a string. It is recommended * to use * InflectedWordElement`as created by the PhraseFactory method createWord(...).`*
Created by	The default is created by the `PhraseFactory when creating * clauses.`
Used by	The syntax processor uses the value of this feature when adding * complements to subordinate clauses.
Applies to	Clauses only.
Default	"that" represented by an `InflectedWordElement` if a * lexicon is used, otherwise a `StringElement`.

Feature name	conjunction
Expected type	A `String`.
Created by	`CoordinatedPhraseElement` creates this feature * automatically. The user can overwrite the value.
Used by	The syntax processor constructs the correct syntax for the * coordinated phrases.
Applies to	`CoordinatedPhraseElement`s.
Default	`null`

Feature name	conjunctionType
Expected type	`ConjunctionType`
Created by	`CoordinatedPhraseElement` sets this value automatically. * It can be overwritten by the user.
Used by	The syntax processor constructs the correct syntax for the * coordinated phrases.
Applies to	`CoordinatedPhraseElement`s.
Default	`ConjunctionType.COORDINATING`

Feature name	appositive
Expected type	`boolean`
Created by	The user.
Used by	The orthography processor to determine comma placement.
Applies to	Any phrase which is a postmodifier of another phrase.
Default	`false` or `null`

Feature name	cuePhrase
Expected type	`NLGElement`
Created by	Cue phrases need to be specifically added by the user.
Used by	The syntax processor places the cue phrase at the start of a * sentence.
Applies to	Sentences.
Default	`null`

Feature name	isElided
Expected type	`Boolean`
Created by	The feature needs to be set by the user.
Used by	The syntax processor removes elided phrases.
Applies to	Noun phrases only.
Default	`Boolean.FALSE`

Feature name	form
Expected type	`Form`
Created by	Initially created by the phrase factory when constructing verb * phrases. The user is free to set the value accordingly.
Used by	The syntax processor set the form on sentences to be the same as that * from the containing verb phrase. The syntax processor will also check a * verb's form for the addition of supporting words such as will * and to. The morphology processor uses the form to determine the * actual inflection of the verb to be used.
Applies to	Nouns, verbs noun phrases and verb phrases.
Default	`Form.NORMAL`

Feature name	interrogativeType
Expected type	`InterrogativeType`
Created by	The user must set this value.
Used by	The syntax processor uses this feature to correctly structure * interrogative clauses.
Applies to	Clauses only.
Default	`null`.

Feature name	isComparative
Expected type	`Boolean`
Created by	The user.
Used by	The morphology processor to correctly inflect the word.
Applies to	Adjectives and adverbs only
Default	`Boolean.FALSE`.

Feature name	isSuperlative
Expected type	`Boolean`
Created by	The user.
Used by	The morphology processor to correctly inflect the word.
Applies to	Adjectives and adverbs only
Default	`Boolean.FALSE`.

Feature name	modal
Expected type	`String`
Created by	The user.
Used by	The syntax processor adds modals into the structure.
Applies to	Clauses, coordinated phrases and verb phrases. In the case of clauses * and coordinated phrases, the modal is passed on to the underlying verb * phrase.
Default	`null`.

Feature name	isNegated
Expected type	`Boolean`
Created by	The user.
Used by	The syntax processor, which will correctly add in all necessary * auxiliary verbs.
Applies to	Clauses, coordinated phrases and verb phrases. In the case of clauses * and coordinated phrases, the modal is passed on to the underlying verb * phrase. Applying negation to a coordinated phase will negate all the * coordinates.
Default	`Boolean.FALSE`.

Feature name	number
Expected type	`NumberAgreement`
Created by	The phrase factory will create the number in certain cases, mostly in * dealing with pronouns. However, with supporting lexicons a word such as * dogs will be correctly identified as the plural form of * dog. The user can also set this feature.
Used by	The syntax processor ensures number agreement across phrases and * clauses, while the morphology processor uses the feature to pluralise * words.
Applies to	Clauses, coordinated phrases, noun phrases and verb phrases.
Default	`NumberAgreement.SINGULAR`.

Feature name	pattern
Expected type	`Pattern`
Created by	The user.
Used by	The morphology * processor uses this feature to correctly inflect words following a simple * set of rules when no lexicon or user-defined form is supplied.
Applies to	Adjectives, nouns and verbs.
Default	`null`.

Feature name	particle
Expected type	`String` or `NLGElement`
Created by	The phrase factory will automatically check verbs to see if they * contain more than one word. In such a case, the first word becomes the * verb while additional words form the particle. The user can also * explicitly specify a particle
Used by	The syntax processor adds particles into the structure.
Applies to	Verb phrases only.
Default	`null`.

Feature name	isPassive
Expected type	`Boolean`
Created by	User defined.
Used by	The syntax processor uses the passive feature to determine the * correct ordering of subjects and objects in a clause. It also adds in * additional auxiliary verbs to verb phrases, such as was in the * above example. The morphology processor will change pronouns of noun * phrases into passive form.
Applies to	Clauses, noun phrases and verb phrases.
Default	`Boolean.FALSE`.

Feature name	isPerfect
Expected type	`Boolean`
Created by	User defined.
Used by	The syntax processor adds in additional auxiliary verbs to verb * phrases, and alters the form of the main verb.
Applies to	Verbs and verb phrases.
Default	`Boolean.FALSE`.

Feature name	person
Expected type	`Person`
Created by	Will be set automatically by the phrase factory when personal * pronouns are identified. May also be set by the user.
Used by	The syntax processor does some basic checking on the person-nature of * phrases while the morphology processor will correctly inflect pronouns * and verbs.
Applies to	Clauses, coordinated phrases, noun phrases and verb phrases.
Default	`Person.THIRD`.

Feature name	isPossessive
Expected type	`Boolean`
Created by	User defined.
Used by	The syntax processor correctly defines the possessive on noun phrases * that contain more than one subject (we say John and Mary's not John's and Mary's * ). The morphology processor correctly inflects the possessive forms of * nouns and pronouns.
Applies to	Clauses, coordinated phrases and noun phrases.
Default	`Boolean.FALSE` in most cases or for pronouns it is * dependent on the pronoun form used.

Feature name	isPronominal
Expected type	`Boolean`
Created by	User defined.
Used by	The syntax processor will replace the subject of a noun phrase with a * suitable personal pronoun.
Applies to	Noun phrases only.
Default	`Boolean.FALSE`.

Feature name	progressive
Expected type	`Boolean`
Created by	Set by the user.
Used by	The syntax processor adds in required auxiliary verbs when dealing * with the progressive form.
Applies to	Clauses, coordinated phrases and verb phrases only.
Default	`Boolean.FALSE`.

Feature name	raiseSpecifier
Expected type	`Boolean`
Created by	User defined.
Used by	The syntax processor to correctly add or remove specifiers.
Applies to	Coordinated phrases only.
Default	`Boolean.FALSE`

Feature name	suppressGenitive
Expected type	`Boolean`
Created by	The user.
Used by	The syntax processor will set subjects to be possessive when dealing * with the gerund form unless this flag is set.
Applies to	Clauses only.
Default	`Boolean.FALSE`

Feature name	isSuppressedComplementiser
Expected type	`Boolean`
Created by	The phrase factory sets some defaults but can be overridden by the * user.
Used by	The syntax processor will ignore suppressed complementisers on * subordinating clauses.
Applies to	Clauses and coordinated phrases.
Default	`Boolean.FALSE` for clauses or `Boolean.TRUE` * on clauses when added to a coordinated phrase.

Feature name	tense
Expected type	`Tense`
Created by	The user.
Used by	The syntax processor ensures tense on phrases, clauses and * coordinated phrases is passed on to the underlying verb phrases. The * morphology processor uses the tese to correctly inflect verbs.
Applies to	Clauses, coordinated phrases and verb phrases.
Default	`Tense.PRESENT`.