Xmtab data type for a tab stop "xmtab"
#include <Xm/Xm.h> XmTab
XmTab is a data structure that specifies a tab stop to be used in rendering an XmString containing tab components. An XmTab value contains a value, a unit type, an offset model (either XmABSOLUTE or XmRELATIVE), an alignment model (XmALIGNMENT_BEGINNING), and a decimal point character. The resource file syntax for XmTab is specified in the XmTabList reference page.