Hi
I'm trying to do osm-rendering on a temporal indexed database. My
database contains features with a valid_from and a valid_to column. My
Style contains appropriate WHERE-Conditions so select all features from
the database that were valid at a specific point in time.
My Test-Application now uses the python bindings to render the map. It
gets the BBox and Date to render the map from supplied via command line.
It now has to feed the date into the Stylesheet, so that it can be
included at the right place into the queries.
The question is: how to do this nicely - pass Parameters from Python to
the Stylesheet.
Two obvious solutions would be
- preprocess the style with "xmllint --noent", collect the xml into a
string and replace some placeholder, eg. {DATE} with the requested
timestamp, then use mapnik.load_map_from_string. This requires the
libxml2-utils to be installed.
- preprocess the style with the python sax-parser and replace the
placeholder on the go, assemble everything on the go and feed mapnik
with it.
The question is: is there a nicer way to go?
Thank you,
Peter
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