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The following field types are provided by the core system and core modules (many more are provided by contributed modules):
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Boolean, Number (provided by the core system): Stores true/false values and numbers
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Comment (provided by the core Comment module): Allows users to add comments to an entity
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Date, Timestamp (Datetime module): Stores dates and times
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Date range (Datetime range module): Stores time/date periods with a start and an end
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Email (core system): Stores email addresses
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Link (Link module): Stores URLs and link text
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List (Options module): Stores values chosen from pre-defined lists, where the values can be numbers or text; see section below for more on list fields.
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Reference (core system): Stores entity references; see section above
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Telephone (Telephone module): Stores telephone numbers
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Text (Text module): Stores formatted and unformatted text; see section below for more on text fields.
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What settings are available for List field types?
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List fields associate pre-defined <em>keys</em> (or value codes) with <em>labels</em> that the user sees. For example, you might define a list field that shows the user the names of several locations, while behind the scenes a location code is stored in the database. Each list field type corresponds to one type of stored key. For example, a <em>List (integer)</em> field stores integers, while the <em>List (text)</em> field stores text strings. Once you have chosen the field type, the main setting for a list field is the <em>Allowed values</em> list, which associates the keys with the labels.
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What types of Text fields are available?
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There are several types of text fields, with different characteristics. Text fields can be either <em>plain</em> or <em>formatted</em>: plain text fields do not contain HTML, while formatted fields can contain HTML and are processed through <em>text filters</em> (these are provided by the core Filter module; if you have that module enabled, see the related topic below on filters for more information). Text fields can also be regular-length (with a limit of 255 characters) or <em>long</em> (with a very large character limit), and long formatted text fields can include a <em>summary</em> attribute. All possible combinations of these characteristics exist as text field types; for example, <em>Text (plain)</em> and <em>Text (formatted, long, with summary)</em> are two examples of text field types.
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What is a formatter?
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A <em>formatter</em> is a way to display a field; most field types offer several types of formatters, and most formatters have settings that further define how the field is displayed. It is also possible to completely hide a field from display, and you have the option of showing or hiding the field's label when it is displayed.
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What is a widget?
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A <em>widget</em> is a way to edit a field. Some field types, such as plain text single-line fields, have only one widget available (in this case, a single-line text input field). Other field types offer choices for the widget; for example, single-valued <em>List</em> fields can use a <em>Select</em> or <em>Radio button</em> widget for editing. Many widget types have settings that further define how the field can be edited.
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Managing content structure overview
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Besides the field modules listed in the previous section, there are additional core modules that you can use to manage your content structure:
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The core Node, Comment, Content Block, Custom Menu Links, User, File, Image, Media, Taxonomy, and Contact modules all provide content entity types.
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The core Field UI module provides a user interface for managing fields and their display on entities.
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The core Layout Builder module provides a more flexible user interface for configuring the display of entities.
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The core Filter, Responsive Image, and Path modules provide settings and display options for entities and fields.
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Depending on the core and contributed modules that you currently have installed on your site, the related topics below and other topics listed on the main help page (see @help_link) will help you with tasks related to content structure.
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<a href="https://www.drupal.org/docs/user_guide/en/planning-chapter.html">Planning your Site (Drupal User Guide)</a>
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<a href="https://www.drupal.org/docs/user_guide/en/structure-reference-fields.html">Concept: Reference Fields (Drupal User Guide)</a>
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Add a field to an entity sub-type; see @content_structure_topic for an overview of entity types and sub-types, as well as an overview of field types.
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In <em>Add a new field</em>, select the type of field you want to add; see @content_structure_topic for an overview of field types.
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