[,expressionset-method
                        Select a subset
aggregate,validation-method
                        Aggregate validation results
barplot,validation-method
                        Plot number of violations
cells                   Cell counts and differences for a series of
                        datasets
check_that              Simple data validation interface
compare                 Compare similar data sets
confront                Confront data with a (set of) expressionset(s)
created                 Creation timestamp
created<-               Set creation timestamp
created<-,expressionset,POSIXct-method
                        Set timestamps
description             description description
description<-           Set description
description<-,expressionset,character-method
                        Set descriptions
errors                  Get messages from a confrontation object
export_yaml             Export to yaml file
label                   label description of rules
label<-                 Set label
label<-,expressionset,character-method
                        Set labels
length                  Get object lenght
match_cells             Create matching subsets of a sequence of data
names,expressionset-method
                        Extract names
names<-,expressionset,character-method
                        Set names
origin                  Origin of rules
origin<-                Set origin
origin<-,expressionset,character-method
                        Set origins
retailers               data on retailers
sort,validation-method
                        Aggregate and sort the results of a validation.
summary                 Create a summary
syntax                  Syntax to define validation or indicator rules
validate                Data Validation Infrastructure
validation-class        Store results of evaluating validating
                        expressions
validator               Define validation rules for data
values                  Get values from object
variables               Extract variable names
voptions                Set or get options globally or per object.
