Repeating elements

We can repeat any element in the context (if in an extractor that has a sequence). These repeats are either greedy or non-greedy.

Use a “greedy repeat” metadata to model how many times the element that shares the ordering prefix should repeat by. A greedy repeat will look for the longest match it can find, repeatedly extracting the repeated element up to the number of repeats given, and extract those. This is the one we usually want as it intuitively gets what we typically mean by “repeating”. Use a “non-greedy repeat” metadata to model how many times the element that shares the ordering prefix should repeat by. The non-greedy repeat will look for the shortest match it can find, repeatedly extracting the repeated element up to the number of repeats specified.