-In this menu you can define the \b Name of the algorithm, the algeady
-meshed source \b Edge and the \b Mesh (optional, use it if there are several
-different meshes on the same edge). It could also be necessary to
-define the orientation of edges, which is done by indicating the
-<b>Source Vertex</b> being the first point of the Source Edge and the
-<b>Target Vertex</b> being the first point of the created \b Edge. For
-a group of edges, <b>Source</b> and <b>Target</b> vertices should be
-shared by only one edge of the group. If <b>Source</b> and
-<b>Target</b> vectors are specified, the elements of the group must be ajacent.
-
-\n <b>Projection 2D</b> algorithm permits to define the mesh of a face
-(or group of faces) by the
-projection of another already meshed face (or group of faces). This
-algorithm works only
-if all edges of the target face have been meshed as 1D Projections of
-the edges of the source face.
+In this dialog you can define
+<ul>
+ <li> the \b Name of the algorithm,</li>
+ <li> the already meshed <b> Source Edge</b> and </li>
+ <li> the <b>Source Mesh </b> (It can be omitted only when projecting
+ a sub-mesh on another one of the same Mesh).</li>
+ <li> It could also be necessary to define the orientation of edges,
+ which is done by indicating the <b>Source Vertex</b> being the
+ first point of the <b>Source Edge </b>and the <b>Target Vertex</b> being
+ the first point of the edge being meshed.</li>
+</ul>
+<br>
+For a group of edges, <b>Source</b> and <b>Target</b> vertices should be
+shared by only one edge of the group. If <b>Source</b> and <b>Target</b>
+vertices are specified, the edges in the group must be connected.
+The source and target groups must contain equal number of edges
+and they must form topologically equal structures.
+
+\n <b>Projection 2D</b> algorithm allows to define the mesh of a face
+(or group of faces) by the projection of another already meshed face
+(or group of faces). This algorithm works only if all edges of the
+target face have been discretized into the same number of
+segments as corresponding edges of the source face.