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NAME
    FingerprintsBitVector

SYNOPSIS
    use Fingerprints::FingerprintsBitVector;

    use Fingerprints::FingerprintsBitVector qw(:coefficients);

    use Fingerprints::FingerprintsBitVector qw(:all);

DESCRIPTION
    FingerprintsBitVector class provides the following methods:

    new, BaroniUrbaniSimilarityCoefficient, BuserSimilarityCoefficient,
    CosineSimilarityCoefficient, DennisSimilarityCoefficient,
    DiceSimilarityCoefficient, FoldFingerprintsBitVectorByDensity,
    FoldFingerprintsBitVectorBySize, ForbesSimilarityCoefficient,
    FossumSimilarityCoefficient, GetBitsAsBinaryString,
    GetBitsAsDecimalString, GetBitsAsHexadecimalString,
    GetBitsAsOctalString, GetBitsAsRawBinaryString, GetDescription,
    GetFingerprintsBitDensity, GetID, GetSpecifiedSize,
    GetSupportedSimilarityCoefficients, GetVectorType,
    HamannSimilarityCoefficient, IsFingerprintsBitVector, IsSubSet,
    JacardSimilarityCoefficient, Kulczynski1SimilarityCoefficient,
    Kulczynski2SimilarityCoefficient, MatchingSimilarityCoefficient,
    McConnaugheySimilarityCoefficient, NewFromBinaryString,
    NewFromDecimalString, NewFromHexadecimalString, NewFromOctalString,
    NewFromRawBinaryString, OchiaiSimilarityCoefficient,
    PearsonSimilarityCoefficient, RogersTanimotoSimilarityCoefficient,
    RussellRaoSimilarityCoefficient, SetDescription, SetID,
    SetSpecifiedSize, SetVectorType, SimpsonSimilarityCoefficient,
    SkoalSneath1SimilarityCoefficient, SkoalSneath2SimilarityCoefficient,
    SkoalSneath3SimilarityCoefficient, StringifyFingerprintsBitVector,
    TanimotoSimilarityCoefficient, TverskySimilarityCoefficient,
    WeightedTanimotoSimilarityCoefficient,
    WeightedTverskySimilarityCoefficient, YuleSimilarityCoefficient

    The methods available to create fingerprints bit vector from strings and
    to calculate similarity coefficient between two bit vectors can also be
    invoked as class functions.

    FingerprintsBitVector class is derived from BitVector class which
    provides the functionality to manipulate bits.

    For two fingerprints bit vectors A and B of same size, let:

        Na = Number of bits set to "1" in A
        Nb = Number of bits set to "1" in B
        Nc = Number of bits set to "1" in both A and B
        Nd = Number of bits set to "0" in both A and B

        Nt = Number of bits set to "1" or "0" in A or B (Size of A or B)
        Nt = Na + Nb - Nc + Nd

        Na - Nc = Number of bits set to "1" in A but not in B
        Nb - Nc = Number of bits set to "1" in B but not in A

    Then, various similarity coefficients [ Ref. 40 - 42 ] for a pair of bit
    vectors A and B are defined as follows:

    BaroniUrbani: ( SQRT( Nc * Nd ) + Nc ) / ( SQRT ( Nc * Nd ) + Nc + ( Na
    - Nc ) + ( Nb - Nc ) ) ( same as Buser )

    Buser: ( SQRT ( Nc * Nd ) + Nc ) / ( SQRT ( Nc * Nd ) + Nc + ( Na - Nc )
    + ( Nb - Nc ) ) ( same as BaroniUrbani )

    Cosine: Nc / SQRT ( Na * Nb ) (same as Ochiai)

    Dice: (2 * Nc) / ( Na + Nb )

    Dennis: ( Nc * Nd - ( ( Na - Nc ) * ( Nb - Nc ) ) ) / SQRT ( Nt * Na *
    Nb)

    Forbes: ( Nt * Nc ) / ( Na * Nb )

    Fossum: ( Nt * ( ( Nc - 1/2 ) ** 2 ) / ( Na * Nb )

    Hamann: ( ( Nc + Nd ) - ( Na - Nc ) - ( Nb - Nc ) ) / Nt

    Jaccard: Nc / ( ( Na - Nc) + ( Nb - Nc ) + Nc ) = Nc / ( Na + Nb - Nc )
    (same as Tanimoto)

    Kulczynski1: Nc / ( ( Na - Nc ) + ( Nb - Nc) ) = Nc / ( Na + Nb - 2Nc )

    Kulczynski2: ( ( Nc / 2 ) * ( 2 * Nc + ( Na - Nc ) + ( Nb - Nc) ) ) / (
    ( Nc + ( Na - Nc ) ) * ( Nc + ( Nb - Nc ) ) ) = 0.5 * ( Nc / Na + Nc /
    Nb )

    Matching: ( Nc + Nd ) / Nt

    McConnaughey: ( Nc ** 2 - ( Na - Nc ) * ( Nb - Nc) ) / ( Na * Nb )

    Ochiai: Nc / SQRT ( Na * Nb ) (same as Cosine)

    Pearson: ( ( Nc * Nd ) - ( ( Na - Nc ) * ( Nb - Nc ) ) / SQRT ( Na * Nb
    * ( Na - Nc + Nd ) * ( Nb - Nc + Nd ) )

    RogersTanimoto: ( Nc + Nd ) / ( ( Na - Nc) + ( Nb - Nc) + Nt) = ( Nc +
    Nd ) / ( Na + Nb - 2Nc + Nt)

    RussellRao: Nc / Nt

    Simpson: Nc / MIN ( Na, Nb)

    SkoalSneath1: Nc / ( Nc + 2 * ( Na - Nc) + 2 * ( Nb - Nc) ) = Nc / ( 2 *
    Na + 2 * Nb - 3 * Nc )

    SkoalSneath2: ( 2 * Nc + 2 * Nd ) / ( Nc + Nd + Nt )

    SkoalSneath3: ( Nc + Nd ) / ( ( Na - Nc ) + ( Nb - Nc ) ) = ( Nc + Nd )
    / ( Na + Nb - 2 * Nc )

    Tanimoto: Nc / ( ( Na - Nc) + ( Nb - Nc ) + Nc ) = Nc / ( Na + Nb - Nc )
    (same as Jaccard)

    Tversky: Nc / ( alpha * ( Na - Nc ) + ( 1 - alpha) * ( Nb - Nc) + Nc ) =
    Nc / ( alpha * ( Na - Nb ) + Nb)

    Yule: ( ( Nc * Nd ) - ( ( Na - Nc ) * ( Nb - Nc ) ) ) / ( ( Nc * Nd ) +
    ( ( Na - Nc ) * ( Nb - Nc ) ) )

    The values of Tanimoto/Jaccard and Tversky coefficients are dependent on
    only those bit which are set to "1" in both A and B. In order to take
    into account all bit positions, modified versions of Tanimoto [ Ref. 42
    ] and Tversky [ Ref. 43 ] have been developed.

    Let:

        Na' = Number of bits set to "0" in A
        Nb' = Number of bits set to "0" in B
        Nc' = Number of bits set to "0" in both A and B

    Tanimoto': Nc' / ( ( Na' - Nc') + ( Nb' - Nc' ) + Nc' ) = Nc' / ( Na' +
    Nb' - Nc' )

    Tversky': Nc' / ( alpha * ( Na' - Nc' ) + ( 1 - alpha) * ( Nb' - Nc' ) +
    Nc' ) = Nc' / ( alpha * ( Na' - Nb' ) + Nb')

    Then:

    WeightedTanimoto = beta * Tanimoto + (1 - beta) * Tanimoto'

    WeightedTversky = beta * Tversky + (1 - beta) * Tversky'

  METHODS
    new
            $NewFPBitVector = new Fingerprints::FingerprintsBitVector($Size);

        Creates a new *FingerprintsBitVector* object of size *Size* and
        returns newly created FingerprintsBitVector. Bit numbers range from
        0 to 1 less than *Size*.

    BaroniUrbaniSimilarityCoefficient
            $Value = $FingerprintsBitVector->BaroniUrbaniSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      BaroniUrbaniSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *BaroniUrbani* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    BuserSimilarityCoefficient
            $Value = $FingerprintsBitVector->BuserSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::BuserSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Buser* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    CosineSimilarityCoefficient
            $Value = $FingerprintsBitVector->CosineSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::CosineSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Cosine* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    DennisSimilarityCoefficient
            $Value = $FingerprintsBitVector->DennisSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::DennisSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Dennis* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    DiceSimilarityCoefficient
            $Value = $FingerprintsBitVector->DiceSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::DiceSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Dice* similarity coefficient between two same size
        *FingerprintsBitVectors*.

    FoldFingerprintsBitVectorByDensity
            $FingerprintsBitVector->FoldFingerprintsBitVectorByDensity($Density);

        Folds *FingerprintsBitVector* by recursively reducing its size by
        half until bit density of set bits is greater than or equal to
        specified *Density* and returns folded *FingerprintsBitVector*.

    FoldFingerprintsBitVectorBySize
            $FingerprintsBitVector->FoldFingerprintsBitVectorBySize($Size);

        Folds *FingerprintsBitVector* by recursively reducing its size by
        half until size is less than or equal to specified *Size* and
        returns folded *FingerprintsBitVector*.

    ForbesSimilarityCoefficient
            $Value = $FingerprintsBitVector->ForbesSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::ForbesSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Forbes* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    FossumSimilarityCoefficient
            $Value = $FingerprintsBitVector->FossumSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::FossumSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Fossum* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    GetBitsAsBinaryString
            $BinaryASCIIString = $FingerprintsBitVector->GetBitsAsBinaryString();

        Returns fingerprints as a binary ASCII string containing 0s and 1s.

    GetBitsAsHexadecimalString
            $HexadecimalString = $FingerprintsBitVector->GetBitsAsHexadecimalString();

        Returns fingerprints as a hexadecimal string.

    GetBitsAsRawBinaryString
            $RawBinaryString = $FingerprintsBitVector->GetBitsAsRawBinaryString();

        Returns fingerprints as a raw binary string containing packed bit
        values for each byte.

    GetDescription
            $Description = $FingerprintsBitVector->GetDescription();

        Returns a string containing description of fingerprints bit vector.

    GetFingerprintsBitDensity
            $BitDensity = $FingerprintsBitVector->GetFingerprintsBitDensity();

        Returns *BitDensity* of *FingerprintsBitVector* corresponding to
        bits set to 1s.

    GetID
            $ID = $FingerprintsBitVector->GetID();

        Returns *ID* of *FingerprintsBitVector*.

    GetVectorType
            $VectorType = $FingerprintsBitVector->GetVectorType();

        Returns *VectorType* of *FingerprintsBitVector*.

    GetSpecifiedSize
            $Size = $FingerprintsBitVector->GetSpecifiedSize();

        Returns value of specified size for bit vector.

    GetSupportedSimilarityCoefficients
            @SimilarityCoefficient =
               Fingerprints::FingerprintsBitVector::GetSupportedSimilarityCoefficients();

        Returns an array containing names of supported similarity
        coefficients.

    HamannSimilarityCoefficient
            $Value = $FingerprintsBitVector->HamannSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::HamannSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Hamann* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    IsFingerprintsBitVector
            $Status = Fingerprints::FingerprintsBitVector::
                      IsFingerprintsBitVector($Object);

        Returns 1 or 0 based on whether *Object* is a FingerprintsBitVector
        object.

    IsSubSet
            $Status = $FingerprintsBitVector->IsSubSet($OtherFPBitVector);
            $Status = Fingerprints::FingerprintsBitVector::IsSubSet(
                      $FPBitVectorA, $FPBitVectorB);

        Returns 1 or 0 based on whether first firngerprints bit vector is a
        subset of second fingerprints bit vector.

        For a bit vector to be a subset of another bit vector, both vectors
        must be of the same size and the bit positions set in first vector
        must also be set in the second bit vector.

    JacardSimilarityCoefficient
            $Value = $FingerprintsBitVector->JacardSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::JacardSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Jacard* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    Kulczynski1SimilarityCoefficient
            $Value = $FingerprintsBitVector->Kulczynski1SimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      Kulczynski1SimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Kulczynski1* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    Kulczynski2SimilarityCoefficient
            $Value = $FingerprintsBitVector->Kulczynski2SimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      Kulczynski2SimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Kulczynski2* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    MatchingSimilarityCoefficient
            $Value = $FingerprintsBitVector->MatchingSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      MatchingSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Matching* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    McConnaugheySimilarityCoefficient
            $Value = $FingerprintsBitVector->McConnaugheySimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      McConnaugheySimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *McConnaughey* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    NewFromBinaryString
            $NewFPBitVector = $FingerprintsBitVector->NewFromBinaryString(
                              $BinaryString);
            $NewFPBitVector = Fingerprints::FingerprintsBitVector::NewFromBinaryString(
                              $BinaryString);

        Creates a new *FingerprintsBitVector* using *BinaryString* and
        returns new FingerprintsBitVector object.

    NewFromHexadecimalString
            $NewFPBitVector = $FingerprintsBitVector->NewFromHexadecimalString(
                              $HexdecimalString);
            $NewFPBitVector = Fingerprints::FingerprintsBitVector::
                            NewFromHexadecimalString(
                              $HexdecimalString);

        Creates a new *FingerprintsBitVector* using *HexdecimalString* and
        returns new FingerprintsBitVector object.

    NewFromRawBinaryString
            $NewFPBitVector = $FingerprintsBitVector->NewFromRawBinaryString(
                              $RawBinaryString);
            $NewFPBitVector = Fingerprints::FingerprintsBitVector::
                              NewFromRawBinaryString(
                              $RawBinaryString);

        Creates a new *FingerprintsBitVector* using *RawBinaryString* and
        returns new FingerprintsBitVector object.

    OchiaiSimilarityCoefficient
            $Value = $FingerprintsBitVector->OchiaiSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::OchiaiSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Ochiai* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    PearsonSimilarityCoefficient
            $Value = $FingerprintsBitVector->PearsonSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::PearsonSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Pearson* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    RogersTanimotoSimilarityCoefficient
            $Value = $FingerprintsBitVector->RogersTanimotoSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      RogersTanimotoSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *RogersTanimoto* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    RussellRaoSimilarityCoefficient
            $Value = $FingerprintsBitVector->RussellRaoSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      RussellRaoSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *RussellRao* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    SetSpecifiedSize
            $FingerprintsBitVector->SetSpecifiedSize($Size);

        Sets specified size for fingerprints bit vector.

        Irrespective of specified size, Perl functions used to handle bit
        data in BitVector class automatically sets the size to the next
        nearest power of 2. *SpecifiedSize* is used by FingerprintsBitVector
        class to process any aribitray size during similarity coefficient
        calculations.

    SetDescription
            $FingerprintsBitVector->SetDescription($Description);

        Sets *Description* of fingerprints bit vector and returns
        *FingerprintsBitVector*.

    SetID
            $FingerprintsBitVector->SetID($ID);

        Sets *ID* of fingerprints bit vector and returns
        *FingerprintsBitVector*.

    SetVectorType
            $FingerprintsBitVector->SetVectorType($VectorType);

        Sets *VectorType* of fingerprints bit vector and returns
        *FingerprintsBitVector*.

    SimpsonSimilarityCoefficient
            $Value = $FingerprintsBitVector->SimpsonSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::SimpsonSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Simpson* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    SkoalSneath1SimilarityCoefficient
            $Value = $FingerprintsBitVector->SkoalSneath1SimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      SkoalSneath1SimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *SkoalSneath1* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    SkoalSneath2SimilarityCoefficient
            $Value = $FingerprintsBitVector->SkoalSneath2SimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      SkoalSneath2SimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *SkoalSneath2* similarity coefficient between two
        same size *FingerprintsBitVectors*.

    SkoalSneath3SimilarityCoefficient
            $Value = $FingerprintsBitVector->SkoalSneath3SimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      SkoalSneath3SimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *SkoalSneath3* similarity coefficient between two
        same size *FingerprintsBitVectors*

    StringifyFingerprintsBitVector
            $String = $FingerprintsBitVector->StringifyFingerprintsBitVector();

        Returns a string containing information about
        *FingerprintsBitVector* object.

    TanimotoSimilarityCoefficient
            $Value = $FingerprintsBitVector->TanimotoSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::
                      TanimotoSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Tanimoto* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    TverskySimilarityCoefficient
            $Value = $FingerprintsBitVector->TverskySimilarityCoefficient(
                      $OtherFingerprintBitVector, $Alpha);
            $Value = Fingerprints::FingerprintsBitVector::
                      TverskySimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB, $Alpha);

        Returns value of *Tversky* similarity coefficient between two same
        size *FingerprintsBitVectors*.

    WeightedTanimotoSimilarityCoefficient
            $Value =
               $FingerprintsBitVector->WeightedTanimotoSimilarityCoefficient(
                 $OtherFingerprintBitVector, $Beta);
            $Value =
               Fingerprints::FingerprintsBitVector::
                 WeightedTanimotoSimilarityCoefficient(
                 $FingerprintsBitVectorA, $FingerprintBitVectorB, $Beta);

        Returns value of *WeightedTanimoto* similarity coefficient between
        two same size *FingerprintsBitVectors*.

    WeightedTverskySimilarityCoefficient
            $Value =
               $FingerprintsBitVector->WeightedTverskySimilarityCoefficient(
                  $OtherFingerprintBitVector, $Alpha, $Beta);
            $Value =
              Fingerprints::FingerprintsBitVector::
                WeightedTverskySimilarityCoefficient(
                $FingerprintsBitVectorA, $FingerprintBitVectorB, $Alpha, $Beta);

        Returns value of *WeightedTversky* similarity coefficient between
        two same size *FingerprintsBitVectors*.

    YuleSimilarityCoefficient
            $Value = $FingerprintsBitVector->YuleSimilarityCoefficient(
                      $OtherFingerprintBitVector);
            $Value = Fingerprints::FingerprintsBitVector::YuleSimilarityCoefficient(
                      $FingerprintsBitVectorA, $FingerprintBitVectorB);

        Returns value of *Yule* similarity coefficient between two same size
        *FingerprintsBitVectors*.

AUTHOR
    Manish Sud <[e-mail]>

SEE ALSO
    BitVector.pm, FingerprintsStringUtil.pm, FingerprintsVector.pm,
    Vector.pm

COPYRIGHT
    Copyright (C) 2015 Manish Sud. All rights reserved.

    This file is part of MayaChemTools.

    MayaChemTools is free software; you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 3 of the License, or (at
    your option) any later version.