remove "none" value of the attributes onUpdate and onDelete of the foreign-key element

In Torque 3.3, the description of the attribute idMethod is
<!ATTLIST foreign-key
...
onUpdate (cascade|setnull|restrict|none) "none"
onDelete (cascade|setnull|restrict|none) "none"
>

There is no reason to have the explicit value "none". As with other attributes (e.g. attribute "default" on the element "column"), leaving the attribute empy is more intuitive than having the string value "none".

Therefore, the suggestion would be to change the definition to

onUpdate (cascade|setnull|restrict) #IMPLIED
onDelete (cascade|setnull|restrict) #IMPLIED

or its xsd equivalent.