add signature for several XDI_validate functions

Author: newville

c/xdifile.h

@@ -62,8 +62,15 @@ _EXPORT(int)  XDI_readfile(char *filename, XDIFile *xdifile) ;
 _EXPORT(int)  XDI_get_array_index(XDIFile *xdifile, long n, double *out);
 _EXPORT(int)  XDI_get_array_name(XDIFile *xdifile, char *name, double *out);
 _EXPORT(int)  XDI_required_metadata(XDIFile *xdifile);
+_EXPORT(int)  XDI_recommended_metadata(XDIFile *xdifile);
 _EXPORT(int)  XDI_defined_family(XDIFile *xdifile, char *family);
 _EXPORT(int)  XDI_validate_item(XDIFile *xdifile, char *family, char *name, char *value);
+_EXPORT(int)  XDI_validate_mono(XDIFile *xdifile, char *name, char *value);
+_EXPORT(int)  XDI_validate_sample(XDIFile *xdifile, char *name, char *value);
+_EXPORT(int)  XDI_validate_scan(XDIFile *xdifile, char *name, char *value);
+_EXPORT(int)  XDI_validate_column(XDIFile *xdifile, char *name, char *value);
+_EXPORT(int)  XDI_validate_element(XDIFile *xdifile, char *name, char *value);
+
 _EXPORT(void) XDI_cleanup(XDIFile *xdifile, long err);
 
 /* Tokens used in XDI File */