Returns a list of valid viewport layers in a specified layout blocks.
(map_pltblkvps name)
Returns a list of the valid viewport layers or nil if the block name or layout block is invalid.
| name | Layout block name (string) |
Returns a list of valid viewport layers in a specified layout blocks.
(map_pltblkvps name)
Returns a list of the valid viewport layers or nil if the block name or layout block is invalid.
| name | Layout block name (string) |