XmStringCompare returns a Boolean value indicating the results of a semantically equivalent comparison of
two compound strings.
Semantically equivalent means that the strings have the same text components, font list element tags,
directions, and separators. In general, if two compound strings are created with the same (char*) string
using XmStringCreateLocalized in the same language environment, the compound strings compare as equal.
If two compound strings are created with the same text and tag argument using XmStringCreate, the strings
compare as equal.
s1 Specifies a compound string to be compared with s2s2 Specifies a compound string to be compared with s1