[mkgmap-dev] Further possible removals from builtin-tag-list

Sat Aug 27 23:36:32 BST 2011

Hi,

I want to remove a long list of tags from the builtin-tag-list by 
different actions. The advantage is that specialised styles that do not 
need these tags are faster and do consume less memory.

== Tags that are no longer used ==

Tag: osm:id
There are only two references in mkgmap source code: HighwayHook sets 
this tag and StyleConverter that reads this tag. I think this is not an 
OSM tag but a tag set internally by mkgmap.
If so we should rename it to mkgmap:osmid. Any objections?

Tag: openGeoDB:postal_codes
I haven't found any references in the source code. openGeoDB workout 
have been removed with locator branch merge.

== Tags that can be moved to style handling ==

I am thinking about moving some static coded rules (e.g. name of a POI 
street is taken from tag "addr:street") to the style system as it has 
been done with other location items:
mkgmap:street!=* & addr:street=* { set mkgmap:street='${addr:street}' }

This has two advantages:
1. Speed improvement for styles that don't use this information. (Marko: 
this should help you with your need for speed improvements for special 
styles)

2. More flexiblity: If someone likes to use different tags for a POI 
street name it is easy to configure that.

Possible downside:
* Little more memory requirement for styles that use address information

The tags to be changed are:
addr:street
addr:housename
addr:housenumber
addr:phone (is currently not used in mkgmap)
phone
is_in

== Tags that are used only if --route is set ==

I am not sure if that's correct. Can someone please confirm that?

access
bicycle
carpool
delivery
emergency
except
exception
foot
goods
hgv
motorcar
motorcycle
psv
restriction
route
taxi
toll

WanMil