check_schema            Validate a data.frame against a schema
is_all_distinct         Check if all values in a vector are distinct
is_incrementing         Check if the vector is sorted numerically or
                        alphanumerically
is_non_null             Check if all values are not NA
is_positive_integer     Check if a vector has all positive integers
is_text                 Check if a vector is text-based (character or
                        factor)
is_whole_number         Check if a vector has all whole numbers
last_check_errors       Retrieve latest schematic run time errors
mod_infinitable         Ignore infinite values in a predicate
mod_nullable            Allow NA in a predicate
print.Schema            Print method for Schema
schema                  Create a schema object
