get_docvars: Internal function to extract docvars
Description
Internal function to extract docvars
Usage
get_docvars(x, field = NULL, user = TRUE, system = FALSE, drop = FALSE)
Arguments
- x
- an object from which docvars are extracted 
- field
- name of docvar fields 
- user
- if - TRUE, return user variables
 
- system
- if - TRUE, return system variables
 
- drop
- if - TRUE, convert data.frame with one variable to a vector