Package 'dataset'

Coerce to character vector

Description

Coerce to character vector

Usage

as_character(x)

## S3 method for class 'haven_labelled_defined'
as_character(x)

Arguments

x	A vector created with defined.

Value

A character vector.

Examples

as_character(iris_dataset$Species)

---

Coerce a defined vector to numeric

Description

Coerce a defined vector to numeric

Usage

as_numeric(x)

## S3 method for class 'haven_labelled_defined'
as_numeric(x)

Arguments

x	A vector created with defined.

Value

A numeric vector.

Examples

as_numeric(iris_dataset$Petal.Length)

---

Get/set the Creator of the object.

Description

Add the optional Creator property as an attribute to a dataset object.

Usage

creator(x)

creator(x, overwrite = TRUE) <- value

Arguments

x	A semantically rich data frame object created by dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the attributes should be overwritten. In case it is set to FALSE, it gives a message with the current Creator property instead of overwriting it. Defaults to TRUE when the attribute is set to value regardless of previous setting.
value	The Creator as a utils::person object.

Details

The Creator corresponds to dct:creator in Dublin Core and Creator in DataCite. The name of the entity that holds, archives, publishes prints, distributes, releases, issues, or produces the dataset. This property will be used to formulate the citation, so consider the prominence of the role.

Value

The Creator attribute as a character of length one is added to x.

See Also

Other Bibliographic reference functions: dataset_title()

Examples

creator(iris_dataset)
# To change author:
creator(iris_dataset) <- person("Jane", "Doe")
# To add author:
creator(iris_dataset, overwrite=FALSE) <- person("John", "Doe")

---

Create a bibentry object with DataCite metadata fields

Description

Add metadata conforming the DataCite Metadata Schema.

Usage

datacite(
  Title,
  Creator,
  Identifier = NULL,
  Publisher = NULL,
  PublicationYear = NULL,
  Subject = subject_create(term = "data sets", subjectScheme =
    "Library of Congress Subject Headings (LCSH)", schemeURI =
    "https://id.loc.gov/authorities/subjects.html", valueURI =
    "http://id.loc.gov/authorities/subjects/sh2018002256"),
  Type = "Dataset",
  Contributor = NULL,
  DateList = ":tba",
  Language = NULL,
  AlternateIdentifier = ":unas",
  RelatedIdentifier = ":unas",
  Format = ":tba",
  Version = "0.1.0",
  Rights = ":tba",
  Description = ":tba",
  Geolocation = ":unas",
  FundingReference = ":unas"
)

as_datacite(x, type = "bibentry", ...)

is.datacite(x)

## S3 method for class 'datacite'
is.datacite(x)

Arguments

Title	The name(s) or title(s) by which a resource is known. May be the title of a dataset or the name of a piece of software. Similar to dct:title.
Creator	The main researchers involved in producing the data, or the authors of the publication, in priority order. To supply multiple creators, repeat this property.
Identifier	The Identifier is a unique string that identifies a resource. For software, determine whether the identifier is for a specific version of a piece of software, (per the Force11 Software Citation Principles, or for all versions. Similar to dct:title in dublincore().
Publisher	The name of the entity that holds, archives, publishes prints, distributes, releases, issues, or produces the resource. This property will be used to formulate the citation, so consider the prominence of the role. For software, use Publisher for the code repository. Mandatory in DataCite, and similar to dct:publisher. See publisher().
PublicationYear	The year when the data was or will be made publicly available in YYYY format.See publication_year().
Subject	Recommended for discovery. Subject, keyword, classification code, or key phrase describing the resource. Similar to dct:subject. Use subject to properly add a key phrase from a controlled vocabulary and create structured Subject objects with subject_create.
Type	Defaults to Dataset. The DataCite resourceType definition refers back to dcm:type. The Type$resourceTypeGeneral is set to "Dataset", while the user can set a more specific Type$resourceType value.
Contributor	Recommended for discovery. The institution or person responsible for collecting, managing, distributing, or otherwise contributing to the development of the resource.
DateList	DataCite 4.4 allows to set multiple dates to a resource, they should be added as a list. See: datacite:Date.
Language	The primary language of the resource. Allowed values are taken from IETF BCP 47, ISO 639-1 language code. See language().
AlternateIdentifier	An identifier or identifiers other than the primary Identifier applied to the resource being registered. This may be any alphanumeric string unique within its domain of issue. It may be used for local identifiers. AlternateIdentifier should be used for another identifier of the same instance (same location, same file). Defaults to ":unas" for unassigned values.
RelatedIdentifier	Recommended for discovery. Defaults to ":unas" for unassigned values. Similar to dct:relation.
Format	Technical format of the resource. Use file extension or MIME type where possible, e.g., PDF, XML, MPG or application/pdf, text/xml, video/mpeg. Similar to dct:format.
Version	Free text. Suggested practice: track major_version.minor_version. Defaults to "0.1.0". See version.
Rights	Any rights information for this resource. The property may be repeated to record complex rights characteristics, but this is not yet supported. Free text. See rights. Defaults to ":tba".
Description	Recommended for discovery. All additional information that does not fit in any of the other categories. It may be used for technical information—a free text. Defaults to ":tba". Similar to dct:description.
Geolocation	Recommended for discovery. Spatial region or named place where the data was gathered or about which the data is focused. See geolocation().
FundingReference	Information about financial support (funding) for the resource being registered. Defaults to ":unas" for unassigned values. Complex types with subproperties are not yet implemented.
x	An object that is tested if it has a class "datacite".
type	A DataCite 4.4 metadata can be returned as a type="list", a type="dataset_df", or a type="bibentry" (default).
...	Optional parameters to add to a datacite object. author=person("Jane", "Doe") adds an author to the citation object if type="dataset". as_datacite(iris_dataset, type="list")

Details

DataCite is a leading global non-profit organisation that provides persistent identifiers (DOIs) for research data and other research outputs. Organisations within the research community join DataCite as members to be able to assign DOIs to all their research outputs. This way, their outputs become discoverable, and associated metadata is made available to the community.

The ResourceType property will be by definition "Dataset". The Size attribute (e.g. bytes, pages, inches, etc.) will automatically added to the dataset.

Value

datacite() creates a utils::bibentry object extended with standard Dublin Core bibliographical metadata, as_datacite() retrieves the contents of this bibentry object of a dataset_df from its attributes, and returns the contents as list, dataset_df, or bibentry object.

as_datacite(x, type) returns the DataCite bibliographical metadata of x either as a list, a bibentry object, or a dataset_df object.

is.datacite(x) returns a logical values (if the object x is of class datacite).

Source

DataCite 4.3 Mandatory Properties and DataCite 4.3 Optional Properties

See Also

Other bibentry functions: dublincore(), get_bibentry()

Examples

datacite(
   Title = "Iris Dataset",
   Creator = person(family = "Anderson", given = "Edgar", role = "aut"),
   Publisher = "American Iris Society",
   PublicationYear = 1935,
   Geolocation = "US",
   Language = "en")

as_datacite(iris_dataset)

---

Create a new dataset_df object

Description

The dataset_df constructor creates the objects of this class, which are semantically rich, modern data frames inherited from tibble::tibble.

Usage

dataset_df(
  ...,
  dataset_bibentry = NULL,
  var_labels = NULL,
  units = NULL,
  definitions = NULL,
  dataset_subject = NULL
)

as_dataset_df(
  df,
  var_labels = NULL,
  units = NULL,
  definitions = NULL,
  dataset_bibentry = NULL,
  dataset_subject = NULL,
  ...
)

is.dataset_df(x)

## S3 method for class 'dataset_df'
print(x, ...)

is_dataset_df(x)

Arguments

...	The vectors (variables) that should be included in the dataset.
dataset_bibentry	A list of bibliographic references and descriptive metadata about the dataset as a whole created with datacite or dublincore.
var_labels	The long, human readable labels of each variable.
units	The units of measurement for the measured variables.
definitions	The linked definitions of the variables, attributes, or constants.
dataset_subject	The subject of the dataset, see subject.
df	A data.frame to be converted to dataset_df.
x	A dataset_df object for S3 methods.

Details

To check if an object has the class dataset_df use is.dataset_df.

print is the method to print out the semantically rich data frames created with the constructor of dataset_df.

summary is the method to summarise these semantically rich data frames.

For more details, please check the vignette("dataset_df", package = "dataset") vignette.

Value

dataset_df is the constructor of this type, it returns an object inherited from a data frame with semantically rich metadata.

is.dataset_df returns a logical value (if the object is of class dataset_df.)

Examples

my_dataset <- dataset_df(
   country_name = defined(
     c("AD", "LI"),
     definition = "http://data.europa.eu/bna/c_6c2bb82d",
     namespace = "https://www.geonames.org/countries/$1/"),
   gdp = defined(
     c(3897, 7365),
     label = "Gross Domestic Product",
     unit = "million dollars",
     definition = "http://data.europa.eu/83i/aa/GDP")
)

print(my_dataset)

is.dataset_df(my_dataset)

---

Get/set the title of a dataset

Description

Get or reset the dataset's main title.

Usage

dataset_title(x)

dataset_title(x, overwrite = FALSE) <- value

Arguments

x	A dataset object created with dataset_df() or as_dataset_df().
overwrite	If the attributes should be overwritten. In case it is set to FALSE,it gives a warning with the current title property instead of overwriting it. Defaults to FALSE.
value	The name(s) or title(s) by which a resource is known. See: dct:title.

Details

In the DataCite definition, several titles can be used; it is not yet implemented.

Value

A string with the dataset's title; set_dataset_title returns a dataset object with the changed (main) title.

See Also

Other Bibliographic reference functions: creator()

Examples

dataset_title(iris_dataset)
dataset_title(iris_dataset, overwrite = TRUE) <-"The Famous Iris Dataset"
dataset_title(iris_dataset)

---

Dataset to triples (three columns)

Description

The dataset is converted into a three-column long format with columns s for subject, p for predicate and o for object.

Usage

dataset_to_triples(x, idcol = NULL)

Arguments

x	An R object that contains the data of the dataset (a data.frame or inherited from data.frame), for example, dataset_df().
idcol	The identifier column. If idcol is NULL it attempts to use the row.names(df) as an idcol.

Value

The long form version of the original dataset, retaining the attributes and class.

Examples

dataset_to_triples(iris_dataset)

---

Create a semantically well-defined, labelled vector

Description

The defined constructor creates the objects of this class, which are semantically extended vectors inherited from haven::labelled.

Usage

defined(
  x,
  labels = NULL,
  label = NULL,
  unit = NULL,
  definition = NULL,
  namespace = NULL
)

is.defined(x)

## S3 method for class 'haven_labelled_defined'
as.character(x, ...)

## S3 method for class 'haven_labelled_defined'
summary(object, ...)

Arguments

x	A vector to label. Must be either numeric (integer or double) or character.
labels	A named vector or NULL. The vector should be the same type as x. Unlike factors, labels don't need to be exhaustive: only a fraction of the values might be labelled.
label	A short, human-readable description of the vector or NULL.
unit	A character string of length one containing the unit of measure or NULL.
definition	A character string of length one containing a linked definition or NULL.
namespace	A namespace for individual observations or categories or NULL.
...	Further parameters for inheritance, not in use.
object	An R object to be summarised.

Details

as.character coerces a defined vector into a character vector.
summary summarises the defined vector.
For more details, please check the vignette("defined", package = "dataset") vignette.

Value

The constructor defined returns a vector with defined value labels, a variable label, an optional unit of measurement and linked definition.
is.defined returns a logical value, stateing if the object is of class defined.

See Also

Other defined metadata methods and functions: var_label(), var_namespace(), var_unit()

Examples

gdp_vector <- defined(
  c(3897, 7365, 6753),
  label = "Gross Domestic Product",
  unit = "million dollars",
  definition = "http://data.europa.eu/83i/aa/GDP"
 )

 # To check the s3 class of the vector:
 is.defined(gdp_vector)

 # To print the defined vector:
 print(gdp_vector)

 # To summarise the defined vector:
 summary(gdp_vector)

 # Subsetting work as expected:
 gdp_vector[1:2]

---

Get/set the Description of the object.

Description

Get/set the optional Description property as an attribute to an R object.

Usage

description(x)

description(x, overwrite = FALSE) <- value

Arguments

x	A dataset object created with dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the Description attribute should be overwritten. In case it is set to FALSE, it gives a message with the current Description property instead of overwriting it. Defaults to FALSE, when it gives a warning at an accidental overwrite attempt.
value	The Description as a character set.

Details

The Description is recommended for discovery in DataCite. All additional information that does not fit in any of the other categories. May be used for technical information. A free text. Similar to dct:description.

Value

The Description attribute as a character of length 1 is added to x.

See Also

Other Reference metadata functions: geolocation(), identifier(), language, publication_year(), publisher(), rights()

Examples

description(iris_dataset, overwrite = TRUE) <- "The famous iris dataset used
in R language examples."
description(iris_dataset)

---

Add or get Dublin Core metadata

Description

Add metadata conforming the DCMI Metadata Terms. to datasets, i.e. structured R data.frame or list objects, for an accurate and consistent identification of a resource for citation and retrieval purposes.

Usage

dublincore(
  title,
  creator,
  identifier = NULL,
  publisher = NULL,
  subject = NULL,
  type = "DCMITYPE:Dataset",
  contributor = NULL,
  date = NULL,
  language = NULL,
  relation = NULL,
  format = "application/r-rds",
  rights = NULL,
  datasource = NULL,
  description = NULL,
  coverage = NULL
)

as_dublincore(x, type = "bibentry", ...)

is.dublincore(x)

## S3 method for class 'dublincore'
is.dublincore(x)

Arguments

title	dct:title, a name given to the resource. datacite allows the use of alternate titles, too. See dataset_title.
creator	An entity primarily responsible for making the resource. dct:creator Corresponds to Creator in datacite. See creator.
identifier	An unambiguous reference to the resource within a given context. Recommended practice is to identify the resource by means of a string conforming to an identification system. Examples include International Standard Book Number (ISBN), Digital Object Identifier (DOI), and Uniform Resource Name (URN). Select and identifier scheme from registered URI schemes maintained by IANA. More details: Guidelines for using resource identifiers in Dublin Core metadata and IEEE LOM. Similar to Identifier in datacite. See identifier.
publisher	Corresponds to dct:publisher and Publisher in DataCite. The name of the entity that holds, archives, publishes prints, distributes, releases, issues, or produces the resource. This property will be used to formulate the citation, so consider the prominence of the role. For software, use Publisher for the code repository. If there is an entity other than a code repository, that "holds, archives, publishes, prints, distributes, releases, issues, or produces" the code, use the property Contributor/contributorType/hostingInstitution for the code repository. See publisher.
subject	Defaults to NULL. See subject to add subject descriptions to your dataset.
type	The nature or genre of the resource. Recommended best practice is to use a controlled vocabulary such as the DCMI Type Vocabulary DCMITYPE. For a dataset, the correct term is Dataset. To describe the file format, physical medium, or dimensions of the resource, use the Format element.
contributor	An entity responsible for making contributions to the dataset. See DCMI: Contributor.
date	Corresponds to a point or period of time associated with an event in the lifecycle of the resource. dct:date. Date is also recommended for discovery in datacite, but it requires a different formatting.
language	A language of the dataset. See DCMI: Language.
relation	A related resource. Recommended best practice is to identify the related resource by means of a string conforming to a formal identification system. See: dct:relation. Similar to RelatedItem in datacite, which is recommended for discovery.
format	The file format, physical medium, or dimensions of the dataset. See DCMI: Format.
rights	Corresponds to dct:rights and datacite Rights. Information about rights held in and over the resource. Typically, rights information includes a statement about various property rights associated with the resource, including intellectual property rights. See rights.
datasource	The source of the dataset, DCMI: Source, which corresponds to a relatedItem in the DataCite vocabulary. We use datasource instead of source to avoid naming conflicts with the
description	An account of the resource. It may include but is not limited to: an abstract, a table of contents, a graphical representation, or a free-text account of the resource. dct:description. In datacite it is recommended for discovery. See description.
coverage	The spatial or temporal topic of the resource, spatial applicability of the dataset, or jurisdiction under which the dataset is relevant. See DCMI: Coverage.
x	An object that is tested if it has a class "dublincore".
...	Optional parameters to add to a dublincore object. author=person("Jane", "Doe") adds an author to the citation object if type="dataset".

Details

The Dublin Core, also known as the Dublin Core Metadata Element Set (DCMES), is a set of fifteen main metadata items for describing digital or physical resources, such as datasets or their printed versions. Dublin Core has been formally standardized internationally as ISO 15836, as IETF RFC 5013 by the Internet Engineering Task Force (IETF), as well as in the U.S. as ANSI/NISO Z39.85.

The ResourceType property will be by definition "Dataset". The Size attribute (e.g. bytes, pages, inches, etc.) will automatically added to the dataset.

Value

dublincore() creates a utils::bibentry object extended with standard Dublin Core bibliographical metadata, as_dublincore() retrieves the contents of this bibentry object of a dataset_df from its attributes, and returns the contents as list, dataset_df, or bibentry object.

A logical value, if the bibliographic entries are listed according to the Dublin Core specification.

Source

DCMI Metadata Terms.

See Also

Other bibentry functions: datacite(), get_bibentry()

Examples

my_bibentry <- dublincore(
   title = "Iris Dataset",
   creator = person("Edgar", "Anderson", role = "aut"),
   publisher = "American Iris Society",
   datasource = "https://doi.org/10.1111/j.1469-1809.1936.tb02137.x",
   date = 1935,
   language = "en",
   description = "This famous (Fisher's or Anderson's) iris data set gives the
   measurements in centimeters of the variables sepal length and width and petal length
   and width, respectively, for 50 flowers from each of 3 species of iris.
   The species are Iris setosa, versicolor, and virginica."
  )

as_dublincore(iris_dataset, type="list")

---

Get/set the Geolocation of the object.

Description

Get/set the optional Geolocation property as an attribute to an R object.

Usage

geolocation(x)

geolocation(x, overwrite = TRUE) <- value

Arguments

x	A semantically rich data frame object created by dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the attributes should be overwritten. In case it is set to FALSE, it gives a message with the current Geolocation property instead of overwriting it. Defaults to TRUE when the attribute is set to value regardless of previous setting.
value	The Geolocation as a character string.

Details

The Geolocation is recommended for discovery in DataCite 4.4. Spatial region or named place where the data was gathered or about which the data is focused. See: datacite:Geolocation.

Value

The Geolocation attribute as a character of length 1 is added to x.

See Also

Other Reference metadata functions: description(), identifier(), language, publication_year(), publisher(), rights()

Examples

iris_dataset <- iris
geolocation(iris_dataset) <- "US"
geolocation(iris_dataset)

geolocation(iris_dataset, overwrite = FALSE) <- "GB"

---

Get/set the Bibentry of the object.

Description

The dataset_df objects contain among their attributes bibliographic entries which are stored in a utils::bibentry object. Upon creation, these entries are filled with default values when applicable.

To retrieve the bibentry of a dataset_df object, use get_bibentry.

To create a new bibentry, use the datacite function for an interface and default values according to the DataCite standard, or the dublincore function for the more general Dublin Core standard.

To change or an entire new bibliographic entry to a dataset_df object (or any data.frame-like object), use the `set_bibentry<-` function (see examples.) For more details, please check the vignette("bibentry", package="dataset") vignette.

Usage

get_bibentry(dataset)

set_bibentry(dataset) <- value

Arguments

dataset	A dataset created with dataset_df.
value	A utils::bibentry object, or a newly initialised bibentry object with DataCite default values for unassigned entries.

Value

The get_bibentry returns from the bibentry object of x from its attributes; the `set_bibentry<-` assignment function sets this attribute to value and invisibly returns x with the changed attributes. To set well-formatted input value, refer to datacite or dublincore (see Details.)

See Also

Other bibentry functions: datacite(), dublincore()

Examples

# Get the bibentry of a dataset_df object:
iris_bibentry <- get_bibentry(iris_dataset)

# Create a well-formatted bibentry object:
alternative_bibentry <- datacite(
     Creator=person("Jane Doe"),
     Title ="The Famous Iris Dataset",
     Publisher = "MyOrg")

# Assign the new bibentry object:
set_bibentry(iris_dataset) <- alternative_bibentry

# Print the bibentry object according to the DataCite notation:
as_datacite(iris_dataset, "list")

# Print the bibentry object according to the Dublin Core notation:
as_dublincore(iris_dataset, "list")

---

Add identifier to columns

Description

Add a prefixed identifier to the first column of the dataset.

Usage

id_to_column(x, prefix = "eg:", ids = NULL)

Arguments

x	A dataset created with dataset_df.
prefix	Defaults to eg: (example.com).
ids	Defaults to NULL.

Value

A dataset conforming the original sub-class of x.

Examples

# Example with a dataset_df object:
id_to_column(iris_dataset)

# Example with a data.frame object:#'
id_to_column(iris, prefix="eg:iris-o")

---

Get/set the Identifier of the object.

Description

Add the optional Identifier property as an attribute to an R object.

Usage

identifier(x)

identifier(x, overwrite = TRUE) <- value

Arguments

x	An R object, such as a data.frame, a tibble, or a data.table.
overwrite	If the attributes should be overwritten. In case it is set to FALSE, it gives a message with the current Identifier property instead of overwriting it. Defaults to TRUE when the attribute is set to value regardless of previous setting.
value	The Identifier as a character string.

Details

The Identifier is an unambiguous reference to the resource within a given context. Recommended practice is to identify the resource by means of a string conforming to an identification system. Examples include International Standard Book Number (ISBN), Digital Object Identifier (DOI), and Uniform Resource Name (URN). Select and identifier scheme from registered URI schemes maintained by IANA. More details: Guidelines for using resource identifiers in Dublin Core metadata and IEEE LOM. Similar to Identifier in datacite. DataCite 4.4.
It is not part of the "core" Dublin Core terms, but we always add it to the metadata attributes of a dataset (in case you use a strict Dublin Core property sheet you can omit it.) Dublin Core metadata terms.

Value

The Identifier attribute as a character of length 1 is added to x.

See Also

Other Reference metadata functions: description(), geolocation(), language, publication_year(), publisher(), rights()

Examples

identifier(iris_dataset) <- "https://doi.org/10.1111/j.1469-1809.1936.tb02137.x"
identifier(iris_dataset)

---

Edgar Anderson's Iris Data

Description

This famous (Fisher's or Anderson's) iris data set gives the measurements in centimetres of the variables sepal length and width and petal length and width, respectively, for 50 flowers from each of 3 species of iris. The species are Iris setosa, versicolor, and virginica. This is a replication of datasets::iris as dataset s3 class.

Usage

iris_dataset

Format

iris is a data frame with 150 cases (rows) and 6 variables (columns) named rowid, Sepal.Length, Sepal.Width, Petal.Length, Petal.Width, and Species.

Details

See datasets::iris for details.

Source

Fisher, R. A. (1936) The use of multiple measurements in taxonomic problems. Annals of Eugenics, 7, Part II, p179–188.

The data were collected by Anderson, Edgar (1935). The irises of the Gaspe Peninsula, Bulletin of the American Iris Society, 59, 2–5.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

---

Get/Set the primary language of the dataset

Description

Add the optional Language property as an attribute to an R object.

Usage

language(x)

language(x, iso_639_code = "639-3") <- value

Arguments

x	A semantically rich data frame object created by dataset_df or as_dataset_df.
iso_639_code	Defaults to ISO 639-3, alternative is ISO 639-1.
value	The language to be added to the object attributes, added by name, or as a 2- or 3-character code for the language. You can add a language code or language name, and the parameter is normalized to tolower(language). (The ISO 639 standard capitalizes language names and uses lower case for the codes.)

Details

Language is an optional property in DataCite 4.4; see: datacite:Language
It is a part of the "core" of the Dublin Core metadata terms. The language parameter is validated against the [ISOcodes]{ISO_639_2} table.
The attribute language is added to the object. It will be exported into DataCite applications in a capitalized Lanugage format.

Value

The Language is added to the x as ISO 639-1, the Datacite recommendation, or ISO 639-3 used by the Zenodo data repository.

See Also

Other Reference metadata functions: description(), geolocation(), identifier(), publication_year(), publisher(), rights()

Examples

myiris <- iris_dataset
language(myiris) <- "English"
language(myiris)
language(myiris) <- "fr"
language(myiris)

---

Create an N-Triple

Description

Create a single N-Triple triple.

Usage

n_triple(s, p, o)

Arguments

s	The subject of a triplet.
p	The predicate of a triplet.
o	The object of a triplet.

Details

N-Triples is an easy to parse line-based subset of Turtle to serialize RDF. An N-Triple triple is a sequence of RDF terms representing the subject, predicate and object of an RDF Triple. Use n_triples to serialize multiple statements.

Value

A character vector containing one N-Triple string.

Source

RDF 1.1 N-Triples

Examples

s <- "http://example.org/show/218"
p <- "http://www.w3.org/2000/01/rdf-schema#label"
o <- "That Seventies Show"
n_triple(s, p, o)

---

Create N-Triples

Description

Create triple statements to annotate your dataset with standard, interoperable metadata.

Usage

n_triples(triples)

Arguments

triples

Concatenated N-Triples created with n_triple.

Details

N-Triples is an easy to parse line-based subset of Turtle to serialize RDF. See RDF 1.2 N-Triples. A line-based syntax for an RDF graph.

Value

A character vector containing unique N-Triple strings.

Examples

triple_1 <- n_triple("http://example.org/show/218",
                      "http://www.w3.org/2000/01/rdf-schema#label",
                      "That Seventies Show")
triple_2 <- n_triple("http://example.org/show/218",
                     "http://example.org/show/localName",
                     '"Cette Série des Années Septante"@fr-be')
n_triples(c(triple_1, triple_2, triple_1))

---

Get or update provenance information

Description

Add or update information about the history (provenance) of the dataset.

Usage

provenance(x)

provenance(x) <- value

Arguments

x	A dataset created with dataset_df.
value	Use n_triples to add further statement values.

Value

provenance(x) returns the provenance attributes created by n_triples as a text; provenance(x)<-value adds the new provenance attributes and returns x invisibly.

Examples

provenance(iris_dataset)

## add a statement:

 provenance(iris_dataset) <- n_triple(
  "https://doi.org/10.5281/zenodo.10396807",
  "http://www.w3.org/ns/prov#wasInformedBy",
  "http://example.com/source#1")

---

Get/set the publication_year of the object.

Description

Get/set the optional publication_year property as an attribute to an R object.

Usage

publication_year(x)

publication_year(x, overwrite = TRUE) <- value

Arguments

x	A semantically rich data frame object created by dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the attributes should be overwritten. In case it is set to FALSE, it gives a message with the current PublicationYear property instead of overwriting it. Defaults to TRUE when the attribute is set to value regardless of previous setting.
value	The publication_year as a character set.

Details

The PublicationYear is the year when the data was or will be made publicly available in YYYY format. See Publication Year: DataCite Additional Guidance.

Value

Returns the year metadata field of the DataBibentry of the dataset

See Also

Other Reference metadata functions: description(), geolocation(), identifier(), language, publisher(), rights()

Examples

publication_year(iris_dataset)
publication_year(iris_dataset) <- 1936

---

Get/set the Publisher of the object.

Description

Add the optional Publisher property as an attribute to an R object.

Usage

publisher(x)

publisher(x, overwrite = TRUE) <- value

Arguments

x	A dataset object created with dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the attributes should be overwritten. In case it is set to FALSE,it gives a warning with the current publisher property instead of overwriting it. Defaults to FALSE.
value	The Publisher as a character set.

Details

The Publisher corresponds to dct:publisher and Publisher in DataCite. The name of the entity that holds, archives, publishes prints, distributes, releases, issues, or produces the resource. This property will be used to formulate the citation, so consider the prominence of the role. For software, use Publisher for the code repository. If there is an entity other than a code repository, that "holds, archives, publishes, prints, distributes, releases, issues, or produces" the code, use the property Contributor/contributorType/ hostingInstitution for the code repository.

Value

The Publisher attribute as a character of length 1 is added to x.

See Also

Other Reference metadata functions: description(), geolocation(), identifier(), language, publication_year(), rights()

Examples

publisher(iris_dataset) <- "American Iris Society"
publisher(iris_dataset)

---

Get/set the Rights of the object.

Description

Get/set the optional Rights property as an attribute to an R object.

Usage

rights(x)

rights(x, overwrite = FALSE) <- value

Arguments

x	A semantically rich data frame object created by dataset::dataset_df or dataset::as_dataset_df.
overwrite	If the Rights attribute should be overwritten. In case it is set to FALSE, it gives a message with the current Rights property instead of overwriting it. Defaults to FALSE.
value	The Rights as a character set.

Details

Rights corresponds to dct:rights and datacite Rights. Information about rights held in and over the resource. Typically, rights information includes a statement about various property rights associated with the resource, including intellectual property rights.

Value

The Rights attribute as a character of length 1 is added to x.

See Also

Other Reference metadata functions: description(), geolocation(), identifier(), language, publication_year(), publisher()

Examples

rights(iris_dataset) <- "CC-BY-SA"
rights(iris_dataset)

---

Create/add/retrieve a subject

Description

Create/add/retrieve a subject

Usage

subject(x)

subject_create(
  term,
  schemeURI = NULL,
  valueURI = NULL,
  prefix = NULL,
  subjectScheme = NULL,
  classificationCode = NULL
)

subject(x) <- value

is.subject(x)

Arguments

x	A dataset object created with dataset_df or dataset::as_dataset_df.
term	A subject term, for example, "Data sets".
schemeURI	The URI of the subject identifier scheme, for example "http://id.loc.gov/authorities/subjects"
valueURI	The URI of the subject term. "https://id.loc.gov/authorities/subjects/sh2018002256"
prefix	An abbreviated prefix of a scheme URI, for example, "lcch:" representing "http://id.loc.gov/authorities/subjects". Widely used namespaces (schemes) have conventional abbreviations.
subjectScheme	The name of the subject scheme or classification code or authority if one is used. It is a namespace.
classificationCode	The classificationCode subproperty may be used for subject schemes, like ANZSRC, which do not have valueURIs for each subject term.
value	A subject field created by subject. The subject field is overwritten with this value.

Details

The subject class and its function record the subject property of the dataset. The DataCite definition allows the use of multiple subproperties, however, these cannot be added to the standard utils::bibentry object. Therefore, if the user sets the value of the subject field to a character string, it is added to the bibentry of the dataset, and also to a separate subject attribute. If the user wants to use the more detailed subproperties (see examples with subject_create), then the subject$term value is added to the bibentry as a text, and the more complex subject object is added as a separate attribute to the dataset_df object.#'

Value

subject(x) returns the subject attribute of the dataset_df object x, subject(x)<-value sets the same attribute to value and invisibly returns the x object with the changed attributes.

A subject_create returns a named list with the subject term, the subject scheme, URIs and prefix.

is.subject returns a logical value, TRUE if the subject as a list is well-formatted by subject_create with its necessary key-value pairs.

Examples

# To set the subject of a dataset_df object:
subject(iris_dataset) <- subject_create(
         term  = "Irises (plants)",
         schemeURI = "http://id.loc.gov/authorities/subjects",
         valueURI = "https://id.loc.gov/authorities/subjects/sh85068079",
         subjectScheme = "LCCH",
         prefix = "lcch:")

# To retrieve the subject with its subproperties:
subject(iris_dataset)

---

Get / set a definition for a vector or a dataset

Description

Get / set a definition for a vector or a dataset

Usage

var_definition(x, ...)

var_definition(x) <- value

definition_attribute(x)

get_definition_attribute(x)

set_definition_attribute(x, value)

definition_attribute(x) <- value

Arguments

x	a vector
...	Further parameters for inheritance, not in use.
value	a character string or NULL to remove the definition of measure.

Details

get_variable_definitions() is identical to var_definition().

Value

The (linked) definition of the meaning of the data contained by a vector constructed with defined.

Examples

small_country_dataset <- dataset_df(
  country_name = defined(c("Andorra", "Lichtenstein"), label  = "Country"),
  gdp = defined(c(3897, 7365),
                      label = "Gross Domestic Product",
                      unit = "million dollars")
)
var_definition(small_country_dataset$country_name) <- "http://data.europa.eu/bna/c_6c2bb82d"
var_definition(small_country_dataset$country_name)
# To remove a definition of measure
var_definition(small_country_dataset$country_name) <- NULL

---

Get / Set a variable label

Description

Add a human readable, easier to understand label as a metadata attribute to a variable or vector than the programmatic vector object name, or column name in the data frame.

Usage

## S3 method for class 'defined'
var_label(x, ...)

## S3 method for class 'dataset_df'
var_label(
  x,
  unlist = FALSE,
  null_action = c("keep", "fill", "skip", "na", "empty"),
  recurse = FALSE,
  ...
)

label_attribute(x)

## S3 replacement method for class 'defined'
var_label(x) <- value

## S3 replacement method for class 'dataset_df'
var_label(x) <- value

Arguments

x	a vector or a data.frame
...	Further potential parameters reserved for inherited classes.
unlist	for data frames, return a named vector instead of a list
null_action	for data frames, by default NULL will be returned for columns with no variable label. Use "fill" to populate with the column name instead, "skip" to remove such values from the returned list, "na" to populate with NA or "empty" to populate with an empty string ("").
recurse	if TRUE, will apply var_label() on packed columns (see tidyr::pack()) to return the variable labels of each sub-column; otherwise, the label of the group of columns will be returned.
value	a character string or NULL to remove the label For data frames, with var_labels(), it could also be a named list or a character vector of same length as the number of columns in x.

Details

See labelled::var_label for details about variable labels.
See vignette("defined", package = "dataset") to use comprehensively with variable labels, namespaces, units of measures, and machine-independent permanent variable identifiers.

Value

var_label() returns returns the label attribute as a character string. The var_label<- assignment method allows to add, remove, or overwrite this attribute on a vector x. The assignment function returns the x vector invisibly.

See Also

Other defined metadata methods and functions: defined(), var_namespace(), var_unit()

Examples

iris_dataset_2 <- iris_dataset

# Retrieve the label attribute:
var_label(iris_dataset_2$Sepal.Length)

---

Get / Set a namespace of measure

Description

Retain the namespace part of a permanent, global variable identifier which is independent of the R instance in use.

Usage

var_namespace(x, ...)

var_namespace(x) <- value

get_variable_namespaces(x, ...)

namespace_attribute(x)

get_namespace_attribute(x)

set_namespace_attribute(x, value)

namespace_attribute(x) <- value

Arguments

x	a vector
...	Further potential parameters reserved for inherited classes.
value	a character string or NULL to remove the namespace of measure.

Details

The namespace attribute is useful when users join or concatenate data from remote, linked, and open data sources. In such cases, variable identifiers (labels or names) are often resolved with a common namespace prefix, which, together with the namespace, forms a URI or IRI permanent identifier for the variable. Retaining the namespace in such cases allows cross-validation or success later updates of the vector (as a column of a dataset.)

get_variable_namespaces() is identical to var_namespace(). See vignette("defined", package = "dataset") to use comprehensively with variable labels, namespaces, units of measures, and machine-independent permanent variable identifiers.

Value

The namespace attribute of a vector constructed with defined.

See Also

Other defined metadata methods and functions: defined(), var_label(), var_unit()

Examples

qid = defined(c("Q275912", "Q116196078"), namespace = "https://www.wikidata.org/wiki/")
var_namespace(qid)

# To remove a namespace
var_namespace(qid) <- NULL

---

Get / Set a unit of measure

Description

Get / Set a unit of measure

Usage

var_unit(x, ...)

var_unit(x) <- value

get_variable_units(x, ...)

unit_attribute(x)

get_unit_attribute(x)

set_unit_attribute(x, value)

unit_attribute(x) <- value

Arguments

x	A vector.
...	Further potential parameters reserved for inherited classes.
value	A character string or NULL to remove the unit of measure.

Details

The aim of the unit attribute is to add to the R vector object its unit of measure (for example, physical units like gram and kilogram or currency units like dollars or euros), so that they are not concatenated or joined in a syntactically correct but semantically incorrect way (i.e., accidentally concatenating values quoted in dollars and euros from different subvectors.) This is particularly useful when working with linked open data, i.e., when joins or concatenations are performed on data arriving from a remote source.

get_variable_units() is identical to var_unit().

See vignette("defined", package = "dataset") to use comprehensively with variable labels, namespaces, units of measures, and machine-independent permanent variable identifiers.

Value

The unit attribute of a vector constructed with defined, or any vector that is enriched with a unit attribute.

The var_unit<- assignment method allows to add, remove, or overwrite this attribute on a vector x. The assignment function returns the x vector invisibly.

See Also

Other defined metadata methods and functions: defined(), var_label(), var_namespace()

Examples

# The defined vector class and dataset_df support units of measure attributes:
var_unit(iris_dataset$Sepal.Length)

# Normally columns of a data.frame do not have a unit attribute:
var_unit(iris$Sepal.Length)

# You can add them with the assignment function:
var_unit(iris$Sepal.Length) <- "centimeter"

# To remove a unit of measure assign the NULL value:
var_unit(iris$Sepal.Length) <- NULL

---

Convert to XML Schema Definition (XSD) types

Description

Convert the numeric, boolean and Date/time columns of a dataset xs:decimal, xsLboolean, xs:date and xs:dateTime.

Usage

xsd_convert(x, idcol, ...)

## S3 method for class 'data.frame'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'dataset'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'tibble'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'character'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'numeric'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'haven_labelled_defined'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'integer'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'logical'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'factor'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'POSIXct'
xsd_convert(x, idcol = NULL, ...)

## S3 method for class 'Date'
xsd_convert(x, idcol = NULL, ...)

Arguments

x	An object to be coerced to an XLM Schema defined string format.
idcol	The name or position of the column that contains the row (observation) identifiers. If NULL, it will make a new idcol from row.names().
...	Further optional parameters for generic method.

Value

A serialisation of an R vector or data frame (dataset) in XML.

Examples

# Convert data.frame to XML Schema Definition
xsd_convert(head(iris))

# Convert dataset to XML Schema Definition
xsd_convert(head(iris_dataset))
# Convert integers or doubles, numbers:
xsd_convert(1:3)
# Convert logical values:
xsd_convert(TRUE)

---