info type [...] - info about current DB
agg - aggregators
derived [table[column]] - derived cols
last - cmd time space parts
ref [table[column]] - ref cols
schema [table[column]] - normal cols (non jd...)
summary [table^*] - tables or tables that make up the ptable
table [table^*] - tables or tables that make up the ptable
validate [table[column]]
validatebad [table[column]]
varbyte [table[column]]
Tables are sorted and cols are in default selection order
Schema and similar types treat ptable as a single table
validate and validatebad list ptable parts
list version - Jd version
list open - open databases