cdm/src/main/java/ucar/nc2/dataset/conv/CF1Convention.java
public static int getVersion(String hasConvName) {
    int result = extractVersion(hasConvName);
    if (result >= 0) return result;
    List<String> names = breakupConventionNames(hasConvName);
    for (String name : names) {
      result = extractVersion(name);
      if (result >= 0) return result;
    }
    return -1;
  }
public static int getVersion(String hasConvName) {
    int result = extractVersion(hasConvName);
    if (result >= 0) return result;
    List<String> names = breakupConventionNames(hasConvName);
    for (String name : names) {
      result = extractVersion(name);
      if (result >= 0) return result;
    }
    return -1;
  }
Get which CF version this is, ie CF-1.x
@param hasConvName extract from convention name or list of names
@return version, or -1 if not CF