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* **description**	- describes how the constants are used
* **timestamp**	- when the file was last written
* **version**	- a version number for this PhysicalConstants file [v0.12, v0.10]
* **reference_standard**	- main reference data set for the constant values [CODATA 2014, ]
* **link**	- a url to the source or author of the file
* **items**	- the list of *PhysicalConstant* items

## PhysicalConstant

This describes the attributes of one physical constant.
Options are enclosed in [ ]'s and defaults are **bolded**.

* **name**	- the name of the constant as used in your programming language
* **alternateName**	- used for older names, aliases, can be more than one
  - *type*	- attribute which describes how the alternateName is used.  [alias, deprecated]
  - *version* - version of Constants file in which type decided
* **description**	- text to describe the constant
* **value**	- the numerical value of the constant in SI units
* **uncertainty**	- the uncertainty or error in the value
  - *type*	- is the uncertainty in the same units or expressed as a ratio to the value [absolute, relative].
* **dimensions**	- for future use in dimensional analysis,  lists which of the 7 dimensions the constant consists of (e.g. M for mass, L for length, L3 for volume, ML-3 for density)