DDI-children            Add/remove/change one or more children or
                        attributes from a DDI Codebook attribute.
convert                 Converts a dataset from one statistical
                        software to another
exportCodebook          Export a DDI Codebook to an XML file.
getCodebook             Extract metadata information
makeCategories          Create the 'catgry' elements for a particular
                        variable
makeDataNotes           Create a 'notes' element for the dataset.
makeElement             Make a DDI Codebook element
recodeCharcat           Recode character categorical variables
recodeMissings          Consistent recoding of (extended) missing
                        values
searchFor               Search for key words
setupfile               Create setup files for SPSS, Stata, SAS and R
showDetails             Describe what a DDI element is
testValid               Validate a DDI element.
updateCodebook          Update Codebook.
