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A picture query language, extension of Sequel2.

["An Image-Oriented Database System", Y. Takao et al, in Database Techniques for Pictorial Applications, A. Blaser ed, pp. 527-538].
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add/drop multiplexer

A device installed at an intermediate point on a transmission line that enables new signals to come in and existing signals to go out. In a typical example, most signals pass through the device, but some would be "dropped" by splitting them from the line. Signals originating at that point can be "added" into the line and directed to another destination.

Add/drop multiplexing can be done with optical or electronic signals. The device may deal only with wavelengths, or it may convert between wavelengths and electronic TDM signals. The setup in an add/drop multiplexer is generally static, and the device is not reprogrammed very often. See TDM, DWDM, digital cross-connect, DCS and grooming.

Add/Drop Multiplexer
Note that the new signal being added can use the same optical channel (wavelength) as the dropped signal. (Illustration assistance courtesy of Jeff Hecht.)
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References in periodicals archive ?
ADM can provide export solutions for both bulk and containerized products from all grain exporting ports in Australia.
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Transaction Benefits Business Profile: In Fitch's view the EUR1.5 billion Neovia transaction, which is expected to close in the coming months, is in line with ADM's growth plans to improve capabilities and increase exposure to value-added animal nutrition products and solutions that can serve as a platform for additional potential bolt-on acquisitions to expand the firm's geographical reach.
Visitors to ADM's booth at SIAL are welcome to experience a huge variety of on-trend products covering the beverage, dairy and food sectors as well as the foodservice area.
In a statement, ADM's Department of Urban Planning and Municipalities said owners should also observe all security and safety standards and register in the municipality's preventive maintenance system, approved by ADM.
Depending on the country's import law, ADM can customise blends available with vitamins and aromas for its customers.
The FRA had also turned down ADM's first offer of EGP 35.56 per share, to the surprise of company executives, who said the acquisition was discussed with Investment Minister Sahar Nasr and was meant to mark the launch of ADM's expansion plans in Egypt.
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