# 10.2.3.1 Polyline Representations

Topic Version | 1 | Published | 09/11/2015 | |

For Standard | RESQML v2.0.1 |

A polyline representation is made of a single polyline or "polygonal chain," which may or may not be closed; it can be specified as closed by setting the Boolean value to true. Each polyline representation has an implicit topology. This topology consists of attaching the nodes in sequence by following the order of the nodes contained in the abstract point 3D array, which is an instance of a point 3D HDF5 array. The number of nodes of each polyline representation is given by a “count” value.

For a closed polyline (Boolean = true) the first and the last point are identical (the X,Y,Z value are repeated).