.eval_find              Evaluate .find constructs
.eval_sum               Evaluate .sum constructs
.expect_valid_table     Test for a valid table
.find                   Determine row or column on the fly
.sum                    Summarise groups of rows or columns
.tidyVars               Match variables
.updateFormat           Update the formating of a table
getClusterVar           Extract cluster variables
getData                 Extract summarised data
getGroupVar             Extract cluster group variable
getIDVars               Extract identifying variables
getObsVars              Extract observed variables
reorganise              Reorganise a table
schema-class            The 'schema' class (S4) and its methods
schema_default          Default template of a schema description
setCluster              Set where the clusters are
setFilter               Set filters
setFormat               Set the specific format of a table
setGroups               Set Groups
setIDVar                Set an identifying variable
setObsVar               Set an observed variable
show,schema-method      Print the 'schema'
tabs2shift              List of table types
validateSchema          Check and update schema descriptions
