OPC part names and referenes

Chris Rae Chris.Rae at microsoft.com
Tue Jan 7 19:13:37 CET 2014

I have a feeling that some of the sticking points we discovered with regard to relative references were related to XPS, but I can't remember exactly what the details were. I'll do some investigation.

We'll have to tread somewhat carefully here, as OPC is the most widely implemented part of ISO/IEC 29500.


-----Original Message-----
From: eb2mmrt at gmail.com [mailto:eb2mmrt at gmail.com] On Behalf Of MURATA Makoto
Sent: 06 January 2014 17:20
To: SC34
Subject: Re: OPC part names and referenes

I did some more experiments using MS Office 2007 and .Net.

Here is my understanding.

- MS Office 2007 converts %HH to characters at
  least when %HH represents ASCII characters.

- MS Office 2007 resolves absolute-path references (
  which begins with "/") correctly.

- MS Office 2007 resolves relative-path references (
  which does not begin with "/") correctly.

- .Net (Package.GetPart) recognizes neither relative-path
  references nor %HH

I think that we should limit our concern to MS Office.  The .Net implementation of OPC does not implement Annex A of Part 2 at all.


2013/12/28 MURATA Makoto <eb2m-mrt at asahi-net.or.jp>:
> The more I think about OPC, the more confused I am.
> I have thought that references to OPC parts ("Unicode string"
> in Annex A of OPC) can contain non-ASCII characaters and that such 
> non-ASCII characters are percent-encoded before referenced OPC parts 
> are located.  I have also thought that references to OPC parts are 
> resolved relative to containing OPC parts when they do not begin with 
> "/".
> However, my experiment with .Net in F# appears to show I am mistaken.  
> It reports errors if references to OPC parts contain non-ASCII 
> characters.  Ir also reports errors if references to OPC parts do not 
> begin with "/".
> I plan to manually edit OOXML documents and XPS documents and handle 
> them by MS-Office and XPS viewers.
> Here is my F# program.
> open System.IO.Packaging
> open System
> let readOPC() =
>     let package = Package.Open("f:test.opc", IO.FileMode.Open)
>     let uri = new Uri(Uri.EscapeUriString "/fあ/f1", UriKind.Relative)
>     let part =  package.GetPart(uri)
>     let enum = part.GetRelationships().GetEnumerator()
>     while (enum.MoveNext()) do
>         let relship = enum.Current
>         let targetURI = relship.TargetUri
>         try
>             let targetPart = package.GetPart(targetURI)
>             let s = targetPart.GetStream()
>             System.Console.WriteLine("Success: {0} {1}", targetURI,
> s.ReadByte())
>         with
>             | :? System.ArgumentException ->
> System.Console.WriteLine("Error: {0}", targetURI)
>     package.Close()
> readOPC()
> Regards,
> Makoto


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