A ULPartOfSpeechTagger marks the words in a sentence with parts of speech. The tagger uses a combination of dictionary look-up and rule-based ambiguity resolution to choose parts of speech for each word in the sentence. More...

#include <ulpartofspeechtagger.h>

Public Member Functions
	ULPartOfSpeechTagger ()

	ULPartOfSpeechTagger (const ULPartOfSpeechTagger &other)

virtual	~ULPartOfSpeechTagger ()

ULPartOfSpeechTagger &	operator= (const ULPartOfSpeechTagger &other)

void	clear ()

const ULLanguage &	getLanguage () const

void	setDissector (ULDissector *newDissector)

ULDissector *	getDissector ()

virtual bool	isServiceAvailable (const ULServiceDescriptor &service)

virtual void	getAvailableServices (ULList< ULServiceDescriptor > &services)

ULError	getTags (const ULString &sentence, ULList< ULTaggedWord > &taggedWords)

ULError	getTags (const ULString &sentence, ULList< ULDerivation > &words)

Public Member Functions inherited from ULWorker
	ULWorker ()

virtual	~ULWorker ()

virtual void	setCancelOperation (bool shouldCancel)

virtual bool	shouldCancelOperation () const

Detailed Description

A ULPartOfSpeechTagger marks the words in a sentence with parts of speech. The tagger uses a combination of dictionary look-up and rule-based ambiguity resolution to choose parts of speech for each word in the sentence.

Constructor & Destructor Documentation

ULPartOfSpeechTagger::ULPartOfSpeechTagger ( )

Default constructor.

ULPartOfSpeechTagger::ULPartOfSpeechTagger ( const ULPartOfSpeechTagger & other )

Copy constructor.

ULPartOfSpeechTagger::~ULPartOfSpeechTagger ( )

virtual

Destructor.

Member Function Documentation

void ULPartOfSpeechTagger::clear ( )

Sets this tagger to its default state.

void ULPartOfSpeechTagger::getAvailableServices ( ULList< ULServiceDescriptor > & serviceList )

virtual

Parameters

[out] serviceList Used to return a list of all the services this ULWorker can provide.

Implements ULWorker.

ULDissector * ULPartOfSpeechTagger::getDissector ( )

Returns: a pointer to the ULDissector used by this tagger.

const ULLanguage & ULPartOfSpeechTagger::getLanguage ( ) const

Returns: the language associated with this tagger.

ULError ULPartOfSpeechTagger::getTags	(	const ULString &	sentence,
		ULList< ULTaggedWord > &	taggedWords
	)

Computes part of speech tags for the words in the specified sentence. These tags are returned in the form of a list of ULTaggedWord objects. Each ULTaggedWord object represents the list of possible interpretations of a word from the sentence, ordered by decreasing likelihood. For example, in the sentence "Alice drinks coffee", the most likely interpretation of the word "drinks" would be as the third-person singular form of the verb "to drink". The word "drinks" also has a less likely (in this sentence) interpretation as the plural of the noun "drink". Thus, the ULTaggedWord corresponding to "drinks" in the context of the sentence "Alice drinks coffee" would have two elements, first the verb and second the noun.

Returns: ULError::NoError if the tagging is successful, or some other ULError value otherwise.

Parameters

[in]	sentence	The sentence to be tagged.
[out]	taggedWords	The resulting list of tagged words.

ULError ULPartOfSpeechTagger::getTags	(	const ULString &	sentence,
		ULList< ULDerivation > &	tags
	)

Computes part of speech tags for the words in the specified sentence. These tags are returned in the form of a list of ULDerivation objects. Each ULDerivation corresponds to a single word from the sentence, and identifies the word's surface form, root word, part of speech category, and other word feature information (e.g. the tense and person for a verb).

This version of getTags is provided as a simpler version of the getTags that returns a list of ULTaggedWords. For most applications, knowing the most likely part of speech of a word in a sentence (as opposed to an ordered list of possible parts of speech) will be sufficient.

Returns: ULError::NoError if the tagging is successful, or some other ULError value otherwise.

Parameters

[in]	sentence	The sentence to be tagged.
[out]	tags	The resulting word list.

bool ULPartOfSpeechTagger::isServiceAvailable ( const ULServiceDescriptor & service )

virtual

Returns: true if the specified service can be performed by this ULWorker, and false otherwise.

Parameters

service The desired service.

Implements ULWorker.

ULPartOfSpeechTagger & ULPartOfSpeechTagger::operator= ( const ULPartOfSpeechTagger & other )

Assignment operator.

void ULPartOfSpeechTagger::setDissector ( ULDissector * newDissector )

Assigns a ULDissector to be used by this tagger. The ULPartOfSpeechTagger does not take responsibility for deleting the data source. That will need to happen elsewhere (typically the ULFactory will take care of it if your application uses ULFactory to instantiate data sources and workers).

Parameters

[in] newDissector A pointer to the desired dissector.

The documentation for this class was generated from the following files:

ulpartofspeechtagger.h
ulpartofspeechtagger.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation