File describing boundary conditions for transient gas networks. This contains a list of nodes and a list of edges with data. The additional meta information allows to specify a time, file version, etc. This contains additional information. Mandatory is the version of the file, the date and the time interval with start, end and its unit. The network file that belongs to the boundary conditions. An optional tag to specify the author. The version of the file. The date when the file was created. The time interval (start, end, time unit) for which pressure, flow, valve status, ... is available in this file A value for the speed of sound. A value for the friction coefficient. The pipemodel used to create the data. Possible choices are ISO1, ISO2, ISO3, ISO4. A list of nodes for which data is provided. A specific node on the list of nodes. Information for nodes. Possible choices for nodes: boundary nodes and innodes. Can contain information on time, pressure and/or massflow. A certain timepoint that is considered. Massflow at the current node at a certain timepoint. Pressure at the current node at a certain timepoint. A list of edges for which data is provided. A specific edge on the list of edges. Information for edges. Possible choices for edges: pipes, compressors and valves. Can contain information on time, pressure and/or massflow. In addition, for pipes it can contain information on the space (spatial point according to a space discretization), for compressors information on the pressure difference and for valves on the status (open/closed). A certain timepoint that is considered. Not mandatory. A certain spacial point that is considered. Not mandatory and only for pipes. Massflow at the current edge (at a certain timepoint and spacial point). Pressure at the current pipe (at a certain timepoint and spacial point). Increase of pressure at the current compressor (at a certain timepoint). Mandatory for compressor stations. Status of the current valve. 1 if open, 0 if closed. Mandatory for valves.