Final answer:
Queries from databases or APIs like RESTful services can return results in XML and JSON formats, often specified through SQL functions or HTTP request headers.
Step-by-step explanation:
Queries that can return XML and JSON results are usually associated with web services, APIs (Application Programming Interfaces), and databases. In databases, SQL queries can be constructed to output data in XML format using functions like FOR XML in SQL Server, or using JSON functions and operators in databases like PostgreSQL. With APIs, various endpoints can provide responses in XML or JSON format, depending mainly on the 'Accept' header in the HTTP request or the endpoint's default configuration.
Web services, such as RESTful services, often use HTTP methods like GET, POST, PUT, and DELETE to handle requests and responses in XML or JSON format. When querying these services, you may specify your preferred response format using appropriate headers or parameters in the request.
It's important to tailor your query based on the capabilities of the database or API you are interacting with, ensuring that it can parse and process your query to return the desired data format.