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Application Programming Interface (API) PacaSearch uses a “polling engine” that queries your online database about specific keywords and phrases. The response to a PacaSearch query is textual—no images are involved. In fact, the machine replying to PacaSearch doesn’t have to host, or have access to, any of your imagery. Unlike conventional Web crawlers that scrape your image‐laden search results pages for information, PacaSearch uses a controlled vocabulary to poll your server in a highly efficient manner. (This significantly reduces bandwidth utilization and response time.) PacaSearch does not dictate the format of the URLs requesting information from your server—you decide that. It is the response to these queries that will need to be in a PacaSearch‐friendly format. PacaSearch currently has only four query types. The first two simply return the total number of “still” (photo/illustration) or “motion” (film/animation) items on your website. The format of the HTML page you return for either “total images by media type” query is as follows: 12345 That’s it. If you want to see an example of this in action go to… http://www.rubberball.com/pacaquery.php (for still) http://www.rubberball.com/pacaquery_motion.php (for motion) (View source on the resultant Web page to see the otherwise invisible tags. Rubberball provided the preceding links. You decide what your query URLs will look like.) The “total images by media type” queries are typically asked once a day and are used in PacaSearch’s Relevant Percentage calculation. Your “total images” numbers are never revealed to the user. So, to summarize, your first step is to write a search processor/method that returns the total number of images by media type on your website (in the format described above). If you only support one media type, then you only need to provide the query URL for that type. When developing your PacaSearch responders, focus on reducing computing overhead. Dispensing with session variables, SSL encryption, logging, session validation, etc., is highly recommended but not required. The key is efficiency. Keeping it simple will reduce CPU load and response times. If security is a concern, we suggest using IP range checking to make sure it’s PACA and not someone else hitting your database. PacaSearch queries will originate in the 69.43.202.79 – 94 IP range. The third and fourth PacaSearch query type is a keyword search by media type—one for still and one for motion. As with the previous “total images by media type” query, you decide the format of the URL PacaSearch uses to ask the question. Page 1 PacaSearch Application Programming Interface Ver. 6.110707 Note: This “you decide” feature has been a stumbling block for some since it’s sometimes easier to be told exactly how you will conform to a third‐party’s request for data. However, PacaSearch was designed to adapt to you. Most agencies already have a preferred way to pass search parameters via a URL. The reply to a PacaSearch keyword search for still or motion is an integer indicating the number of images found followed by the URL that reveals the search results on your website. The integer is tagged with and the URL is tagged with . If no images are found, the count will be zero and no URL is required. As earlier mentioned, if you only support one media type, then you only need to provide the query URL for that type. To see two keyword search examples in action, go to… http://www.rubberball.com/pacaquery.php?keyword1=dancing+silhouette (for still) http://www.rubberball.com/pacaquery_motion.php?keyword1=dancing+silhouette (for motion) (View source on the resultant Web page to see the otherwise invisible tags. As before, Rubberball provided the above URL as the prescribed method to perform a PacaSearch keyword query for still or motion images in their database.) Please note that we don’t parse the user’s input. We basically pass it on to you as entered by the user. However we will encode special characters and replace spaces with plus symbols. So “bear grass” (with quotes) becomes %22bear+grass%22. We strongly encourage support of AND, OR, and NOT Boolean logic, in addition to exact matches (quoted strings). For example, much of PacaSearch’s disambiguation logic and keyword expansions use Boolean operators and exact matches. Of particular importance is that “OR” not be ignored and “AND” assumed in its place. (Ex. Interpreting “dog or cat” to be the same as “dog and cat.”) Another practice to avoid is to claim a match when only some of the keywords requested are found. (Ex. A search for “Blarney Castle” yields all castles if “Blarney” is not found—not good.) We'll likely expand the API later to include wild card characters and parentheses (groupings). We also strongly recommend that you omit PacaSearch polling queries from user activity logs and keyword reports. Otherwise it will make is more complicated to determine what your “real” (as opposed to robotic) users are looking for. Or, at a minimum, clearly label queries originating from PacaSearch so they can be filtered out if need be. When you’re ready, send your two (if you only support a single media type) or four (if you support both still and motion on your site) query descriptors to pacasearch@pacaoffice.org. As an example, here is how Rubberball submitted their four PacaSearch query descriptors to us. To get total number of still images: http://www.rubberball.com/pacaquery.php To get total number of motion images: http://www.rubberball.com/pacaquery_motion.php Page 2 PacaSearch Application Programming Interface Ver. 6.110707 To perform keyword search of still images: http://www.rubberball.com/pacaquery.php?keyword1=word1+word2+word3 To perform keyword search of motion images: http://www.rubberball.com/pacaquery_motion.php?keyword1=word1+word2+word3 It only takes a couple minutes for us to hook your site up and test it. We encourage you (or your technology provider) to contact us at pacasearch@pacaoffice.org with any questions. We are very sensitive about resource hogging; so please keep us informed of any issues related to this. We will provide you a dashboard page that will show if polling is running and enable you to suspend polling when need be. We normally only do our polling during off hours at night and on weekends. However, we may fire it up for short periods during the day for test purposes. We've worked hard to make the API simple and adaptive. The majority of agencies that have already implemented the API did so in less than a day (some in less than an hour). If there is something we can do to make it even easier, please let us know. Page 3 PacaSearch Application Programming Interface Ver. 6.110707