Abstract—Crawlers for Virtual Integration processes must be efficient, given that VI process is online, which means that while the system is looking for the required information, the user is waiting for a response. Therefore, downloading a minimum number of irrelevant pages is mandatory in order to improve the crawler efficiency. Most crawlers need to download a page in order the determine its relevance, which results in a high number of irrelevant pages downloaded. We propose a tool that builds a set of prototype links for a given site, where each prototype represents links leading to pages containing a certain concept. These prototypes can then be used to classify pages before downloading them, just by analysing their URL. Therefore, they are the support for crawlers to navigate through sites downloading a minimum number of irrelevant pages while reducing bandwidth, making them suitable for VI systems.