Embodiments of a compressiondecompression system may include a plurality of data compression engines each implementing a different data compression algorithm. The count unit decides digital data of the pixel signal in a 1 LSB step by storing a count value at a point when the comparison processing is completed for any one of the plural kinds of reference signals and correcting the stored count value on the basis of results of the comparison processing for respective remaining reference signals of the plural kinds of reference signals. Then, a statement to create a relational view of the instance data for the base model using the ViewType is automatically generated. In an embodiment, the device includes a fixed collar that is fixed to the flexible members; and a retractable sheath surrounds the flexible members and id fixed to the fixed collar and to the slidable collar, wherein sliding the slidable collar along the flexible member away from the fixed collar extends the sheath along the flexible members. The high melting-point material layer has a melting point equal to or higher than 600\xb0 C.