protected Proto loadFrom(File file, Proto importer) throws Exception
    {
        Proto proto = new Proto(file, this, importer);
        ProtoUtil.loadFrom(file, proto);
        return proto;
    }
Search from every possible resource. Also loads from a remote url (if path starts with http://).
<p>

<pre>
Search order is:
1. relative path
2. proto_path
3. classpath
</pre>
protostuff-parser/src/main/java/io/protostuff/parser/DefaultProtoLoader.java