First of all: thank you for the comments and the suggestions. They are especially welcome since this is the work of a beginner; I will add the particle as suggested asap.
Then a little bit of an explanation. I am aware that this is likely too simple to be approvable, and I believe that this really belongs to the simple edit resources thread.
At the same time though, this model can really benefit from the features of the conventional resource database (the dedicated comment section, a judgement from a reviewer, and so on). In contrast in the simple edit resources thread even a simple series of comments to a submission can make the thread difficult to read and to maintain. That's the real reason for posting it here.
My idea is that this can be labeled substandard, and a clean post linking here can be submitted to the simple edit resources thread.