4. The computer-implemented method of claim 1 , wherein the extractor types include a text extractor specific to a text content type and an image extractor specific to an image content type.
4. The computer-implemented method of claim 1 , wherein the extractor types include a text extractor specific to a text content type and an image extractor specific to an image content type. 5. The computer-implemented method of claim 4 , wherein the content described by the application page data further includes image data depicting an image of the application page.