@Taliesin answers pretty well but misses one thing. What exactly are open data specific questions? My understanding is that open data should be machine-readable. 

Therefore, as I stated in [a similar question targetting specifically data extraction](http://meta.opendata.stackexchange.com/questions/21/are-data-extraction-techniques-on-topic), any question related to formatting data to be easily readable and therefore Open, is related to open data.

To summarize, questions about data extraction techniques are on-topic because it targets opening up data.