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When interacting with a vendor, you should take care to outline the format of expected deliverables: The media on which images are to be delivered: As of this writing, many vendors continue to use CDs and DVDs as the transmission media of choice. In most circumstances, you ll be required to copy image data from the delivery media to a network (see the section Workflow ). If image data spans multiple CDs or DVDs, this can add to overall processing time, as you must copy each media separately. If you expect a particularly large set of documents to be scanned and converted to images, you might prefer a vendor to use an external hard drive as the delivery media, so that processing can be performed in single steps. Image formats: Supported formats are described earlier in this chapter in the section Supported File Types. If the TIFF format is used, you should specify that the TIFF files should be compressed using the Group 4 method of compressing TIFF files. If images should be single- or multi-page: Only the TIFF format allows several images to be combined into a single file. Image name schema: Image names can be the same as the values contained in the associated Concordance database s image key field, or can follow an alternative naming scheme. Image names must be unique in each Windows directory. Two files in a single Windows directory with the same name will cause a naming collision. Images in different Windows folders can share the same name. As long as subordinate folders are different, no naming collision occurs. However, when working with or speaking of images in separate subfolders with identical names, confusion can follow. You might wish to specify that image names throughout a delivery be unique.

This exercise is not an easy one. You can solve it in many ways. The solution shown here uses the EXISTS and the NOT EXISTS operators. You can read it as follows: Search course offerings for which (1) the trainer attended an earlier offering of the same course as a student, and for which (2) the trainer is teaching that course for the first time.

These types are used to determine the rendered output of each field as well as its validation. There are many more types available, including advanced behaviors that come in handy when you use this facility to build CRUD applications out of Moose-based database schema descriptions. The do_apply method does the real work. It fetches the mailer out of the (inherited) target_model attribute and calls send with its attributes as arguments. It returns 1 to suggest success. For a production application, this method would be where you would check for errors during the sending of mail.

Note The second condition is necessary, because otherwise you would also get teach/attend/teach combinations.

Processing Excel files: Excel files can present challenges when converted to images. An Excel workbook can contain two or more separate worksheets. Each worksheet can contain a defined print area so that parts that lay outside the area won t appear on a page when the worksheet is printed. Each worksheet contains cells in columns and rows, and these cells might or might not contain actual data. The width and height of columns and rows can be smaller than the total amount of data contained in cells, so that some data isn t visible. Rows and columns can be resized so that their width or height is zero, an effect that serves to hide the row or column from a user. These characteristics can affect the appearance of images created from worksheets. If a worksheet s associated image is simply identical to what an end user might see if the workbook is opened using Excel, the image might not display all data. To ensure this doesn t happen, the vendor should preprocess Excel workbooks prior to conversion so that hidden rows and columns are resized and all data in cells is visible. If the defined print area s dimensions exceed that of the standard 8.5 11 , you might wish the vendor to use larger image sizes. You might want to have a conversation with a vendor beforehand to confirm these and other preprocessing steps.

Returning to our UI application, we will need a view. Since Reaction s rendering infrastructure is component based, the view is implemented a bit differently from the standard Catalyst view style. That s why Reaction ships with its own View base class that you can just extend: