# .QL

> object-oriented query language

**Wikidata**: [Q4545417](https://www.wikidata.org/wiki/Q4545417)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/.QL)  
**Source**: https://4ort.xyz/entity/ql

## Summary
.QL is an object-oriented query language utilized for code analysis. Developed by Semmle and established in 2007, it functions as a declarative programming language that supports logic programming. The language is statically typed and was influenced by Datalog, a declarative logic programming language created in 1986.

## Key Facts
- **Developer:** Semmle (an English code analysis platform)
- **Inception:** 2007
- **Instance of:** Query language, Declarative programming language
- **Programming Paradigm:** Declarative programming, Object-oriented programming, Logic programming
- **Typing Discipline:** Strong typing, Static typing
- **Influenced By:** Datalog (a declarative logic programming language)
- **Semmle Founding:** Semmle was founded on December 28, 2006, in the United Kingdom
- **Semmle Headquarters:** Oxford
- **Freebase ID:** /m/02rh5fj
- **Wikipedia Title:** .QL

## FAQs
### Q: Who created .QL?
A: .QL was developed by Semmle, an English code analysis platform. Semmle was founded in late 2006 and is headquartered in Oxford, United Kingdom.

### Q: What are the primary programming paradigms used in .QL?
A: .QL is a declarative programming language that also supports object-oriented programming and logic programming. It is classified as both a query language and a declarative programming language.

### Q: What is the typing discipline of .QL?
A: .QL utilizes strong typing and static typing. This ensures that types are checked at compile time rather than at runtime.

## Why It Matters
.QL serves as a significant tool in the realm of static code analysis, developed by Semmle, a platform founded in 2006 in the United Kingdom. As a specialized query language, it allows for the inspection of codebases to identify patterns, bugs, and security vulnerabilities. Its design is influenced by Datalog, a logic programming language dating back to 1986, which grounds .QL in established logical querying principles.

The language matters because it bridges the gap between complex logic programming and practical object-oriented querying. By employing a declarative paradigm with strong, static typing, it enables precise and reliable code analysis. This capability is critical for organizations aiming to maintain high code quality and security standards, making .QL a key technology in modern software development and security auditing.

## Notable For
- **Object-Oriented Querying:** Combines the principles of object-oriented programming with query language capabilities.
- **Logic Programming Foundation:** Notable for being influenced by Datalog, integrating logic programming features.
- **Strong Static Typing:** Distinguished by its strong, static typing discipline, which enhances reliability.
- **Semmle Integration:** Specifically developed by Semmle for advanced code analysis purposes.

## Body
### Development and Creator
.QL was created by Semmle, an English code analysis platform. Semmle was founded on December 28, 2006, and maintains its headquarters in Oxford, United Kingdom. The inception of the .QL language itself is recorded as 2007.

### Technical Classification
.QL is formally classified as an instance of a **query language** and a **declarative programming language**. Unlike imperative languages that describe how to perform tasks, .QL focuses on declaring what data is required.

### Programming Paradigms
The language supports multiple programming paradigms:
*   **Declarative Programming:** It describes the logic of a computation without describing its control flow.
*   **Object-Oriented Programming:** It organizes software design around data, or objects, rather than functions and logic.
*   **Logic Programming:** It bases queries on formal logic, heavily drawing from its influence, Datalog.

### Typing and Influence
.QL features a typing discipline of **strong typing** and **static typing**. This implies that type errors are caught during the compilation phase rather than at runtime, and type conversions are strictly enforced.

The design of .QL is directly **influenced by Datalog**, a declarative logic programming language that originated in 1986. This influence provides .QL with its logic-based querying foundation.