Storage Techniques and Mapping Schemas for XML

An elongated paper document is advanced preferably at a constant rate although incremental advancement may be employed if desired. A plurality of reciprocating solenoid assemblies are mounted in stationary fashion in a closely spaced arrangement and are each provided with reciprocating print wires for impacting an inked ribbon against a paper document. The free ends of the print wires which impact the inked ribbon are slidably mounted within suitable bearings provided within an elongated movable plate with the bearings arranged to align the free ends of the print wires along an imaginary straight line. Means are provided for moving the movable plate substantially in a horizontal direction transverse to the movement of the paper document so as to selectively print a row of dots. The movable member may be guided along a slight incline to compensate for constant paper movement during a printing operation. After completion of the first row, the movable member is reset to the start position which together with the advancement of the paper document places the printer in readiness for selective printing of the next row of dots. Seven rows of dots with a five column width each define alphanumeric characters. Alternatively, the printer may be employed for curve or graph plotting.