Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Write guide on how Data Package compares with CSVW #988

Open
wants to merge 3 commits into
base: main
Choose a base branch
from
Open

Write guide on how Data Package compares with CSVW #988

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
cd48fd8
Write guide on how Data Package compares with CSVW
peterdesmet Oct 19, 2024
2fb5e23
Use "compare with" in title
peterdesmet Oct 19, 2024
258a78b
Format tips as notes
peterdesmet Oct 19, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
191 changes: 191 additions & 0 deletions content/docs/guides/data-package-csvw.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,191 @@
---
title: How does Data Package compare with CSVW
sidebar:
order: 3
---

<table>
<tr>
<th>Authors</th>
<td>Peter Desmet, Evgeny Karev, Sara Petti</td>
</tr>
</table>

In 2016, a working group chartered by W3C created a set of recommendations for documenting and accessing CSV files, collectively called [CSVW on the Web (CSVW)](https://www.w3.org/TR/2016/NOTE-tabular-data-primer-20160225/). These show extensive similarities with the Data Package standard. Below we give an overview of the (dis)similarities between the two.

## Scope

Data Package is a set of specifications to describe datasets, data files and tabular data. It can describe data files that are not tabular and includes extra specifications for those that are (i.e. [Table Dialect](/standard/table-dialect/) and [Table Schema](/standard/table-schema/)).

CSVW is a set of specifications to describe delimited text files (CSV, TSV) only.

## Maintenance

Data Package was published in 2012, updated to v1.0 in 2017 and v2.0 in 2024. It is maintained by a [working group](/overview/governance/). Requests for changes can be proposed by anyone as a [GitHub issue](https://github.com/frictionlessdata/datapackage) or pull request and is [decided upon](/overview/governance/#decision-making) by the working group.

CSVW was published in 2016. Its working group was closed at the time. There is currently a community group, but it does [not have the mandate](https://github.com/w3c/csvw?tab=readme-ov-file#the-present) to make changes to the standard.

## Adoption and Software Support

TODO

## Building on Other Standards

Data Package defines its own properties for often-used properties (such as description, contributors, licences, sources), none of which are required. Users can include properties from other standards as [custom properties](/standard/glossary/#custom-properties). It is also possible to add or extend properties by referencing a JSON schema in [@schema](/standard/data-package/#dollar-schema), which are then automatically picked up by validation software.

CSVW makes extensive use of other standards (such as [JSON-LD](https://www.w3.org/TR/json-ld/), [XML Schema Datatypes](https://www.w3.org/TR/xmlschema11-2/), Compact URIs) and defines how to use those.

## Mapping between CSVW and Data Package Properties

Below is a list of all properties defined in CSVW’s [Metadata Vocabulary for Tabular Data](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/) (version 20151217) and how these are supported in Data Package (v2.0).

### Property Syntax

| CSVW property | Data Package support | Details |
| ---- | ---- | ---- |
| [Array properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#array-properties) | Yes | |
| [Link properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#link-properties) | Partial | [URLs and paths](/standard/glossary/#url-or-path) are supported, but not with a [@base](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dfn-base-url) URL in `@context` |
| [URI template properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#uri-template-properties) | No | |
| [Column reference properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-reference-properties) | Yes | E.g. [schema.primaryKey](/standard/table-schema/#primaryKey) |
| [Object properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#object-properties) | Yes | E.g. [resource.schema](/standard/data-resource/#schema) |
| [Natural language properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#natural-language-properties) | Yes | E.g. [resource.path](/standard/data-resource/#path-or-data) |
| [Atomic properties](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#atomic-properties) | Yes | |

### Top-level Properties

| CSVW property | Data Package support | Details |
| ---- | ---- | ---- |
| [@context](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#context) | No | |

### Table Groups

:::note
Data Package can define more than groups of tables. A [package](/standard/data-package/) can be a set of resources of any type. [Data Resource](/standard/data-resource/) therefore supports features that CSVW does not, such as [format](/standard/data-resource/#format), [mediatype](/standard/data-resource/#mediatype), and [hash](/standard/data-resource/#hash).
:::

| CSVW property | Data Package support | Details |
| ---- | ---- | ---- |
| [tables](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-tables) | Yes | Tables can be defined as [package.resources](/standard/data-package/#resources) with `"type": "table"`.<br><br>Tables that are the same in terms of structure, format, dialect, etc. can be defined as a single resource with multiple files in [resource.path](/standard/data-resource/#path-or-data). Implementations will concatenate those tables. |
| [dialect](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-dialect) | Yes | As [resource.dialect](/standard/data-resource/#dialect) for multiple files in [resource.path](/standard/data-resource/#path-or-data) |
| [notes](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-notes) | Custom property | |
| [tableDirection](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-direction) | No | |
| [tableSchema](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-schema) | Yes | As [resource.schema](/standard/data-resource/#schema) for multiple files in [resource.path](/standard/data-resource/#path-or-data) |
| [transformations](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-transformations) | No | |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-ld-id) | Custom property | |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-group-ld-type) | No | |

### Tables

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [url](http://table-url) | Yes | As [resource.path](/standard/data-resource/#path-or-data) |
| [dialect](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-dialect) | Yes | As [resource.dialect](/standard/data-resource/#dialect) |
| [notes](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-notes) | Custom property | |
| [suppressOutput](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-suppressOutput) | No | |
| [tableDirection](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#tableDirection) | No | |
| [tableSchema](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-schema) | Yes | As [resource.schema](/standard/data-resource/#schema) |
| [transformations](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-transformations) | No | |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-ld-id) | Custom property | Tables are identified by [resource.name](/standard/data-resource/#name) |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#table-ld-type) | Yes | As [resource.type](/standard/data-resource/#type) |

### Schemas

:::note
Data Package [Table Schema](/standard/table-schema/) has features that CSVW schema does not, including [fieldMatch](/standard/table-schema/#fieldsMatch) for matching a schema with data, [missingValues](/standard/table-schema/#missingValues) for multiple (and labelled) missing values, and [uniqueKeys](/standard/table-schema/#uniqueKeys).
:::

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [columns](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-columns) | Yes | As [schema.fields](/standard/table-schema/#fields) |
| [foreignKeys](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-foreignKeys) | Yes | As [schema.foreignKeys](/standard/table-schema/#foreignKeys) |
| [primaryKey](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-primaryKey) | Yes | As [schema.primaryKey](/standard/table-schema/#primaryKey) |
| [rowTitles](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-rowTitles) | No | Titles are defined per field as [field.title](/standard/table-schema/#title) |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-ld-id) | Custom property | |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#schema-ld-type) | No | |

### Columns

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [name](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-name) | Yes | As [field.name](/standard/table-schema/#name) |
| [suppressOutput](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-suppressOutput) | No | |
| [titles](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-titles) | Partial | As [field.title](/standard/table-schema/#title) (a single value) |
| [virtual](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-virtual) | No | |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-ld-id) | Custom property | |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#column-ld-type) | No | |

### Inherited Properties

Data Package properties do not inherit from their parent, unless otherwise specified (e.g. [resource.sources](/standard/data-resource/#sources)). The properties listed below only exist at one level in Data Package, except for `missingValues`.

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [aboutUrl](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-aboutUrl) | Custom property | |
| [datatype](http://cell-datatype) | Yes | As [field.type](/standard/table-schema/#type-and-format) |
| [default](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-default) | No | |
| [lang](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-lang) | No | Suggested as [recipe](/recipes/translation-support/) |
| [null](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-null) | Yes | As [field.missingValues](/standard/table-schema/#field-missingValues) and [schema.missingValues](/standard/table-schema/#missingValues) with options to define multiple values and labels |
| [ordered](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-ordered) | Yes | As [field.categoriesOrdered](/standard/table-schema/#categoriesOrdered) |
| [propertyUrl](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-propertyUrl) | Partial | As [field.rdfType](/standard/table-schema/#rdfType) |
| [required](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-required) | Yes | As [required](/standard/table-schema/#required) field constraint |
| [separator](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-separator) | Yes | As [delimiter](/standard/table-schema/#list) in `list` field type |
| [textDirection](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-textDirection) | No | |
| [valueUrl](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#cell-valueUrl) | No | |

### Common Properties

Common properties can be added in Data Package as [custom properties](/standard/glossary/#custom-properties), which just like CSVW recommends prefixed names. Note however that Data Package has its own definitions for often-used properties (e.g. description), which can exist at all levels.

### Dialect Descriptions

:::note
Data Package [Table Dialect](/standard/table-dialect/) was used as inspiration for CSVW dialect. It has features that CSVW dialect does not, since it covers tabular data formats beyond delimited text files, such as spreadsheets and databases. For delimited text files it supports [headerJoin](/standard/table-dialect/#headerJoin), [doubleQuote](/standard/table-dialect/#doubleQuote), [escapeChar](/standard/table-dialect/#escapeChar), and [nullSequence](/standard/table-dialect/#nullSequence), which CSVW does not.
:::

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [commentPrefix](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-commentPrefix) | Yes | As [dialect.commentChar](/standard/table-dialect/#commentChar) |
| [delimiter](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-delimiter) | Yes | As [dialect.delimiter](/standard/table-dialect/#delimiter) |
| [doubleQuote](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-doubleQuote) | Yes | As [dialect.doubleQuote](/standard/table-dialect/#doubleQuote) |
| [encoding](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-encoding) | Yes | As [resource.encoding](/standard/data-resource/#encoding) |
| [header](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-header) | Yes | As [dialect.header](/standard/table-dialect/#header) |
| [headerRowCount](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-headerRowCount) | Yes | As [dialect.headerRows](/standard/table-dialect/#headerRows) |
| [lineTerminators](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-lineTerminators) | Yes | As [dialect.lineTerminator](/standard/table-dialect/#lineTerminator) |
| [quoteChar](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-quoteChar) | Yes | As [dialect.quoteChar](/standard/table-dialect/#quoteChar) |
| [skipBlankRows](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-skipBlankRows) | No | |
| [skipColumns](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-skipColumns) | No | |
| [skipInitialSpace](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-skipInitialSpace) | Yes | As [dialect.skipInitialSpace](/standard/table-dialect/#skipInitialSpace) |
| [skipRows](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-skipRows) | No | As [dialect.commentRows](/standard/table-dialect/#commentRows) |
| [trim](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-trim) | No | |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-ld-id) | Custom property | |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#dialect-ld-type) | No | |

### Transformation Definitions

Not supported in Data Package.

### Data Types

CSVW defines data types as built-in data types and derived data types. A derived data type extends a built-in data type with formats, constraints, etc. Data Package does not make that distinction, but rather defines a number of [Field Types](/standard/table-schema/#field-types). Depending on the type, it can be extended with a `format` and [constraints](/standard/table-schema/#field-constraints).

:::note
Data Package [Table Schema](/standard/table-schema/) supports data types that CSVW does not, such as (labelled) [categories](/standard/table-schema/#categories) and [geojson](/standard/table-schema/#geojson). It also supports a number of constraints that CSVW does not, such as [unique](/standard/table-schema/#unique) values, [pattern](/standard/table-schema/#pattern) for regex comparison and [enum](/standard/table-schema/#enum) for controlled values, which allow rigorous data validation.
:::

| CSVW property | Data package support | Details |
| ---- | ---- | ---- |
| [base](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-base) | No | All types are defined as [field.type](/standard/table-schema/#type-and-format) |
| [format](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-format) | Yes | As [field.format](/standard/table-schema/#type-and-format) |
| [length](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-length) | No | |
| [minLength](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-minLength) | Yes | As [minLength](/standard/table-schema/#minLength) field constraint |
| [maxLength](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-maxLength) | Yes | As [maxLength](/standard/table-schema/#maxLength) field constraint |
| [minimum](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-minimum) | Yes | As [minimum](/standard/table-schema/#minimum) field constraint |
| [maximum](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-maximum) | Yes | As [maximum](/standard/table-schema/#maximum) field constraint |
| [minInclusive](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-minInclusive) | Yes | As [minimum](/standard/table-schema/#minimum) field constraint |
| [maxInclusive](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-maxInclusive) | Yes | As [maximum](/standard/table-schema/#maximum) field constraint |
| [minExclusive](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-minExclusive) | Yes | As [exclusiveMinimum](/standard/table-schema/#exclusiveMinimum) field constraint |
| [maxExclusive](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-maxExclusive) | Yes | As [exclusiveMaximum](/standard/table-schema/#exclusiveMaximum) field constraint |
| [@id](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-id) | Custom property | |
| [@type](https://www.w3.org/TR/2015/REC-tabular-metadata-20151217/#datatype-type) | No | |

###
Loading