RTEditor/src/main/java/com/onegravity/rteditor/converter/tagsoup/Parser.java
private boolean foreign(String prefix, String namespace) {
        // " for foreignness -- ");
        boolean foreign = !(prefix.equals("") || namespace.equals("") || namespace.equals(theSchema.getURI()));
        return foreign;
    }
private boolean foreign(String prefix, String namespace) {
        // " for foreignness -- ");
        boolean foreign = !(prefix.equals("") || namespace.equals("") || namespace.equals(theSchema.getURI()));
        return foreign;
    }
Return true if we have a foreign name