RDF.ex

v0.5.4

RDF.ex v0.5.4 RDF.Boolean View Source

RDF.Datatype for XSD boolean.

Link to this section Summary

Functions

build_literal(value, lexical, opts)
build_literal_by_lexical(lexical, opts)
build_literal_by_value(value, opts)
ebv(value)

Returns an Effective Boolean Value (EBV)

effective(value)

Alias for ebv/1

fn_not(value)

Returns RDF.true if the effective boolean value of the given argument is RDF.false, or RDF.false if it is RDF.true

greater_than?(literal1, literal2)
less_than?(literal1, literal2)
logical_and(left, right)

Returns the logical AND of the effective boolean value of the given arguments

logical_or(left, right)

Returns the logical OR of the effective boolean value of the given arguments

new!(value, opts \\ %{})
new(value, opts \\ %{})
validate_cast(literal)

Link to this section Functions

Link to this function build_literal(value, lexical, opts) View Source
Link to this function build_literal_by_lexical(lexical, opts) View Source
Link to this function build_literal_by_value(value, opts) View Source
Link to this function ebv(value) View Source

Returns an Effective Boolean Value (EBV).

The Effective Boolean Value is an algorithm to coerce values to a RDF.Boolean.

It is specified and used in the SPARQL query language and is based upon XPath’s fn:boolean. Other than specified in these specs any value which can not be converted into a boolean results in nil.

see

Link to this function effective(value) View Source

Alias for ebv/1.

Link to this function fn_not(value) View Source

Returns RDF.true if the effective boolean value of the given argument is RDF.false, or RDF.false if it is RDF.true.

Otherwise it returns nil.

Examples 

iex> RDF.Boolean.fn_not(RDF.true)
RDF.false
iex> RDF.Boolean.fn_not(RDF.false)
RDF.true

iex> RDF.Boolean.fn_not(true)
RDF.false
iex> RDF.Boolean.fn_not(false)
RDF.true

iex> RDF.Boolean.fn_not(42)
RDF.false
iex> RDF.Boolean.fn_not("")
RDF.true

iex> RDF.Boolean.fn_not(nil)
nil

see https://www.w3.org/TR/xpath-functions/#func-not

Link to this function greater_than?(literal1, literal2) View Source
Link to this function less_than?(literal1, literal2) View Source
Link to this function logical_and(left, right) View Source

Returns the logical AND of the effective boolean value of the given arguments.

It returns nil if only one argument is nil and the other argument is RDF.true and RDF.false if the other argument is RDF.false.

Examples 

iex> RDF.Boolean.logical_and(RDF.true, RDF.true)
RDF.true
iex> RDF.Boolean.logical_and(RDF.true, RDF.false)
RDF.false

iex> RDF.Boolean.logical_and(RDF.true, nil)
nil
iex> RDF.Boolean.logical_and(nil, RDF.false)
RDF.false
iex> RDF.Boolean.logical_and(nil, nil)
nil

see https://www.w3.org/TR/sparql11-query/#func-logical-and

Link to this function logical_or(left, right) View Source

Returns the logical OR of the effective boolean value of the given arguments.

It returns nil if only one argument is nil and the other argument is RDF.false and RDF.true if the other argument is RDF.true.

Examples 

iex> RDF.Boolean.logical_or(RDF.true, RDF.false)
RDF.true
iex> RDF.Boolean.logical_or(RDF.false, RDF.false)
RDF.false

iex> RDF.Boolean.logical_or(RDF.true, nil)
RDF.true
iex> RDF.Boolean.logical_or(nil, RDF.false)
nil
iex> RDF.Boolean.logical_or(nil, nil)
nil

see https://www.w3.org/TR/sparql11-query/#func-logical-or

Link to this function new!(value, opts \\ %{}) View Source