Return a data frame with specifications for descriptor and graphical property fields required for certain object classes used within the package. This is an internal function, not intended to be called by package users.
Descriptor and graphical property fields are documented in
A data frame with one row per descriptor or graphical property field.
name (the name of the field);
mode (mode/type of
values taken by the field); and
NA_ok (logical, TRUE if NA is a
valid value for the field).
Field names are used as the row names of the data frame.
df_from_spec, which uses the output from this function to
create a template data frame containing the required fields;
grSpecs, which returns specifications for the graphical
properties for each element type.
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