# Synchronized Multimedia Integration Language

> XML-based markup language for multimedia presentations

**Wikidata**: [Q1072180](https://www.wikidata.org/wiki/Q1072180)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Synchronized_Multimedia_Integration_Language)  
**Source**: https://4ort.xyz/entity/synchronized-multimedia-integration-language

## Summary
The Synchronized Multimedia Integration Language (SMIL) is an XML-based markup language designed for creating multimedia presentations. Developed by the World Wide Web Consortium (W3C), it functions as a declarative programming language and file format that enables users to define and synchronize multimedia elements such as audio, video, and images.

## Key Facts
- **Official Name:** Synchronized Multimedia Integration Language.
- **Short Name:** SMIL.
- **Developer/Standards Body:** World Wide Web Consortium (W3C).
- **Basis:** Based on XML (Extensible Markup Language).
- **Initial Publication:** June 15, 1998.
- **File Extensions:** `.smil`, `.smi`.
- **Media Types:** `text/smil`, `application/smil+xml` (preferred).
- **Classification:** Markup language, file format, and declarative programming language.
- **Identifiers:** PRONOM ID `fmt/205`; Uniform Type Identifier `com.real.smil`.
- **Aliases:** SMIL 1.0, SMIL 2.0.

## FAQs
### Q: What is the primary use of SMIL?
A: SMIL is used to create multimedia presentations and handle metadata. It allows for the synchronization of different media types, such as text, audio, and video, within a single markup structure.

### Q: When was SMIL first published?
A: SMIL was officially published by the World Wide Web Consortium on June 15, 1998.

### Q: What file extensions are associated with SMIL?
A: The standard file extensions for SMIL files are `.smil` and `.smi`.

### Q: Is SMIL considered a programming language?
A: Yes, SMIL is classified as a declarative programming language, meaning it describes *what* the program should accomplish rather than explicitly listing the steps to achieve it.

## Why It Matters
Synchronized Multimedia Integration Language (SMIL) represents a critical standard in the history of web multimedia. Before the widespread adoption of complex JavaScript frameworks and HTML5 video capabilities, SMIL provided a standardized, XML-based method for defining timing, layout, and animation sequences. By establishing a declarative approach to multimedia, it allowed developers to script complex interactions—such as fading images in sync with audio tracks—without relying on proprietary binary formats.

As a W3C recommendation, it played a foundational role in separating media content from presentation logic. Its influence extended into various sectors, including digital signage and mobile messaging (MMS). Furthermore, its integration with the XML ecosystem meant it could utilize standard DOM (Document Object Model) methods for manipulation, ensuring interoperability across different systems and devices. The existence of specific preservation plans by national archives (such as the U.S. National Archives and the Library of Congress) underscores its status as a significant format in the history of digital communication.

## Notable For
-   **XML-Based Architecture:** It utilizes the standard XML framework, ensuring compatibility with other web standards and data encoding practices established by the W3C.
-   **Declarative Syntax:** Unlike imperative scripting languages, SMIL uses a declarative structure to describe the timeline and behavior of media, simplifying the coordination of parallel and sequential events.
-   **Standardization:** It is an official W3C standard, ensuring that it adheres to strict web consortium guidelines for interoperability and accessibility.
-   **Preservation Status:** The format is distinct enough to have assigned preservation plan IDs (e.g., NARA ID NF00782, LOC ID fdd000572), marking it as a format of record for digital archivists.

## Body

### Development and Standardization
SMIL is a standard developed and maintained by the **World Wide Web Consortium (W3C)**. It was formally published on **June 15, 1998**. As a W3C recommendation, it was designed to fill the gap for a standardized method to present synchronized multimedia on the web. The language is strictly based on **XML** (e.gxtensible Markup Language), leveraging XML's strict tagging structure to define media behaviors.

### Technical Specifications
SMIL is categorized as a **declarative programming language**, a **markup language**, and a **file format**.
*   **MIME Types:** The preferred internet media type is `application/smil+xml`, though `text/smil` is also used.
*   **File Extensions:** Content is typically saved with the extension `.smil` or `.smi`.
*   **Uniform Type Identifier:** `com.real.smil`.
*   **Versions:** The entity includes references to versions **SMIL 1.0** and **SMIL 2.0**.

### Documentation and Identifiers
The language is extensively documented by the W3C and third-party technical archives.
*   **Official Documentation:** Key specifications include the W3C SMIL 3.0 cover page (https://www.w3.org/TR/SMIL3/cover.html).
*   **Library Codes:** It is indexed by the Library of Congress as `fdd000572` and the National Archives (NARA) as `NF00782`.
*   **Database IDs:** It holds a Freebase ID of `/m/073d3` and a PRONOM file format ID of `fmt/205`.

## References

1. [Source](https://www.w3.org/TR/1998/REC-smil-19980615/)
2. Freebase Data Dumps. 2013
3. [Source](https://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types)
4. National Library of Israel Names and Subjects Authority File