A layer has a number of associated parameters. Some parameters
such as named properties, visibility filters, and names are common
to all layers, whether they are tiled layers or just normal layers.
Other parameters are specific to tiled layers. These are the tiling
parameters, the lock filter and the tile loader, introduced in the
previous sections.
Unlike normal layers, when you save a tiled layer to
an .ivl
file, only its attached parameters
are saved with the layer, not the objects it holds.