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# URIs

Resources are identified by URIs. This topic explains how to use URIs when working with the REST API.

In this topic:

## URI syntax

Resources are identified by URIs:

- URIs are used to uniquely identify resources.

- URIs follow STD66 and RFC 3986.

- URIs are case sensitive, including entity and field names. For example, the field id is correct, but ID is incorrect.

- URIs have the following generic syntax:

  <scheme name>:<hierarchical identifier>[?<query>]

Note: For the syntax for specifying parameters in URIs, see Variables and values.

## Scheme name

Scheme is mandatory.

The http/https schemes are the only ones supported.

## Hierarchical identifiers

The hierarchical identifier is mandatory.

The hierarchical identifier has the following generic syntax:

//<authority><path>

Begins with two slashes ("//").

Hierarchical identifier | Description
--- | ---
Authority | Authority is mandatory. Authority has the following generic syntax: <host name>[:<port number>] Host name is separated from the port number with a colon ( : ).
Host name | Host name is mandatory. Host name can be defined by the domain name (DNS domain). Host name can be defined by an IP.
Port number | Port number is optional. Port number is a 16-bit integer. Port number is separated from host name by a colon (:).
Path | Path is mandatory. Path has the following generic syntax: [[/<Segment Name>]] Path represents a sequence of segments. Segments are separated by a slash (/).

## Queries and other URI clauses

Here are guidelines for using queries and other clauses in the URI.

URI component | Guidelines
--- | ---
Queries | Queries and other clauses are optional. Queries have the following generic syntax: ?<parameter name>=<parameter value>[[&<parameter name>=<parameter value>]] Queries are separated from the hierarchical part by a question mark (?). Queries are organized in parameter name/value pairs. Pairs are separated by ampersands (&).
Parameters | Parameters contain a name and a value. Parameter names and parameter values are separated by an equals sign (=) Parameter names are case sensitive. Parameter values are generally not case sensitive.

The following clauses can also be appended to a URI:

- Select fields (fields)

- Sort results (order_by)

- Query

## See also

- Interactive API client
- Entry points
- Collections
- Entities
- Relations

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