We understand the importance of documentation when navigating a system as complex as the AdWords API; for this reason we’ve been working to expand our reference materials to include even more information.
First off, we’ve published a new Selector Fields page that provides information about the fields that can be used in generic selectors. This information was always available on an object’s individual reference page, but now we’ve aggregated it together across entire services for quicker lookups.
Additional information on how to migrate from the service-specific selectors used in versions v200909 through v201008 is available in the Selector Migration Reference.
Next, we’ve added more notes to the Report Types page to indicate which fields will prevent zero-impression rows from being returned in the downloaded report. In general, any field that is a property of an impression or click (such as the date, network, etc) will prevent rows with no impressions from being returned, but we decided to explicitly mark these fields so that the behavior is clear.
Finally, we’ve added new tips to our Best Practices Guide on topics such as deleting entities and using gzip compression. The guide is a great resource for developers starting an AdWords API project, but is also useful for established developers trying to increase the efficiency of their applications.
We’re always looking to expand and improve our documentation, so if you have any feedback for us please post it to the forum.
- 
Eric Koleda, AdWords API Team
