SI DIGITAL FRAMEWORK

This service constitutes the authoritative digital reference for the International System of Units (SI). It provides Permanent Digital Identifiers (PIDs) for the named SI units, SI prefixes, and defining constants, and a parsing tool for the PID and semantic model for compound units.

• SI Reference Point
• Units
  Lists the named SI units
• Prefixes
  Lists the SI prefixes
• Defining Constants
  Returns the defining constants of the SI
• Decisions
  Returns the decisions of the CGPM and the CIPM bearing directly upon definitions of the units of the SI, prefixes defined for use as part of the SI, and conventions for the writing of unit symbols and numbers.

This service provides PIDs for the kinds of quantity included in the SI Brochure and the KCDB, including a parsing tool for the PID and semantic model for compound quantities, and shows the related Service Categories in the KCDB.

• Quantities
  Lists the kinds of quantity included in the KCDB.
• Quantity expressions
  A parsing tool to provide the PID and semantic model for compound quantities.
• Service Categories
  This service shows the related service categories (KCDB) by quantity.