Link to the DGN File

Four numbers link the cells in the dgn file to the attributes in the attribute file. These are stored as an Attribute Linkage. The first two of these are constant for all cells in the file and may be set by the ATTRIBUTE_LINKAGE command. For example, a web-browser is not read and the dgn file itself has no particular requirements:

ATTRIBUTE_LINKAGE 32768 0

Export-DGN generates the other two numbers, which change for each cell in the file.