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Updated Api changes between v2.1 and v2.2 (markdown)

Dane Springmeyer 2013-05-29 11:42:36 -07:00
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Api-changes-between-v2.1-and-v2.2.md

@ -4,6 +4,9 @@
- `ltdl`, `cairomm`, and `libsigc++` dependencies were removed
- Removed the `bind` option for datasources (#1654)
## Changed
- `<Filter>[attr] != ''</Filter>` now matches only empty strings. This syntax previously matched both empty strings and nulls but this behavior was unintended and buggy given that Mapnik has supported a `null` type since 2.0.0. If you wish to filter out all `attr` values that are not `empty strings` or `null` or `false boolean type` then you can do `Filter>[attr]</Filter>` or `<Filter>[attr] != '' and [attr] != null and [attr] != false</Filter>`
## Added
- Added Logging framework documentation synced with 2.2 status: https://github.com/mapnik/mapnik/wiki/Logging
- `DebugSymbolizer` - if used it will draw the invisible collision boxes collected up to that point in rendering the stylesheet. Also can be used to draw all verticies of geometries with `mode=vertex` (#1366)