# Overpass XML

> procedural, imperative XML language for querying OpenStreetMap data through the Overpass API

**Wikidata**: [Q110064130](https://www.wikidata.org/wiki/Q110064130)  
**Source**: https://4ort.xyz/entity/overpass-xml

## Summary
Overpass XML is a procedural and imperative XML-based query language designed for retrieving OpenStreetMap data through the Overpass API. It provides a structured, tag-based format for defining complex geographic queries to filter and extract specific map information.

## Key Facts
- **Developer:** Roland Olbricht.
- **Primary Use:** Querying OpenStreetMap (OSM) data via the Overpass API.
- **Classification:** XML-based format, query language, procedural programming language, and imperative programming language.
- **Syntax Basis:** Built on XML (Extensible Markup Language) standards.
- **Related Language:** Overpass QL, which serves the same purpose but uses a C-based syntax.
- **Naming:** Named after the Overpass API and the XML format.
- **Official Documentation:** Described in the Overpass API Language Guide on the OpenStreetMap Wiki.

## FAQs
### Q: What is the difference between Overpass XML and Overpass QL?
A: Both are languages used to query the Overpass API for OpenStreetMap data. While Overpass XML uses a standard XML-based structure, Overpass QL uses a more concise syntax loosely based on the C programming language.

### Q: Who developed Overpass XML?
A: Overpass XML was developed by Roland Olbricht as a method for interfacing with the Overpass API.

### Q: What programming paradigms does Overpass XML use?
A: It is categorized as both a procedural and an imperative programming language, meaning it defines a sequence of commands for the API to execute to achieve a specific result.

## Why It Matters
Overpass XML is significant because it provides a machine-readable, structured method for interacting with the OpenStreetMap database. By utilizing an XML-based format, it allows developers to integrate geographic data queries into software environments that are already optimized for XML processing. It solves the challenge of selectively extracting data from a massive global dataset, enabling users to isolate specific map features—such as infrastructure, points of interest, or administrative boundaries—without the need to process the entire OpenStreetMap database. Its procedural nature gives users precise control over the data retrieval process, allowing for complex filtering and data manipulation within the query itself.

## Notable For
- **XML Integration:** Uses standard XML tags to define query logic, making it highly compatible with existing XML tools and parsers.
- **Imperative Logic:** Unlike many declarative query languages, it follows an imperative paradigm where the user specifies the steps the API should take.
- **API Specificity:** It is one of the two primary languages specifically built for and used by the Overpass API.
- **Developer Origin:** Created by Roland Olbricht, the developer behind the Overpass API itself.

## Body

### Technical Classification
Overpass XML is formally classified as an XML-based format and a query language. It implements the imperative programming paradigm, which focuses on describing how a program operates through a series of statements. Additionally, it is a procedural language, meaning it is based on the concept of procedure calls and step-by-step execution.

### Relationship to the Overpass API
The language serves as a primary interface for the Overpass API, a tool used to fetch specific parts of OpenStreetMap data. While the Overpass API also supports Overpass QL (a C-style syntax), Overpass XML provides a more verbose and structured alternative that follows XML nesting and tagging conventions.

### Development and Documentation
The language was developed by Roland Olbricht. It is documented extensively in the Overpass API Language Guide on the OpenStreetMap Wiki. This documentation serves as the primary resource for users to understand the XML tags and procedural logic required to construct valid queries for the Overpass API.