Boundary Strings
The input wireframe will generally be a surface, since no boundary strings (or edges) will be detected for a wireframe which is an enclosed solid. You can, therefore, use this function as a validation tool to determine whether a wireframe is properly closed or contains holes.
Wireframe
To process a single wireframe, select the Single option, select the Type of the wireframe, and then the Name of a wireframe of that type.
To process multiple wireframes, expressions, wildcards and partial names may be used in the Name field to select multiple wireframes as an adhoc wireframe set. A right-click Preview option will perform a check of an expression before using that expression to generate an updated list of wireframes. Alternatively, you can click the Expression icon 
and use the Expression Editor to create, modify and validate the expression. When a name or wildcard is entered in the Name field, and the Expression button is selected, the name/wildcard will automatically be converted to a valid expression when opened in the editor.
To process the wireframes in a predefined wireframe set, select the Set option.
It is recommended that you Validate wireframes prior to using them in any process.
String File
File
Enter (or double-click (F3) to select) the name of the String file that will contain the boundary strings generated by the process.
East and North and Z fields
Specify the names of the fields in which Easting, Northing, and Z coordinates will be stored in the String file.
Join field
Specify the name of the field that contains values that define whether data points should be joined by a line i.e. strung. If successive records have the same value in this field, then a line will join the points.
Name and Code fields
To assign wireframe Name and Code attributes to the generated strings, double-click (F3) to select the fields in the String file that you want to assign attributes to.
