Install sdformat-doc by entering the following commands in the terminal:
sudo apt update sudo apt install sdformat-doc
Description:
Simulation Description Format (SDF) parser - Documentation
SDF is an XML file format that describes environments, objects, and robots in a manner suitable for robotic applications. SDF is capable of representing and describing different physic engines, lighting properties, terrain, static or dynamic objects, and articulated robots with various sensors, and acutators. The format of SDF is also described by XML, which facilitates updates and allows conversion from previous versions. A parser is also contained within this package that reads SDF files and returns a C++ interface. . This package contains the program documentation
Homepage: http://sdformat.org
Version: 6.0.0+dfsg-4
Section: universe/doc