Re: [higgins-dev] Improving Higgins XDI syntax

[Drummond Reed <drummond.reed@xxxxxxxxxxxx>]

On Fri, Aug 6, 2010 at 7:06 AM, Paul Trevithick <ptrevithick@xxxxxxxxx> wrote:

Thanks very much Drummond! 

But I think you missed your name on this section (see red below):

On Aug 6, 2010, at 1:16 AM, Drummond Reed wrote:

Similarly, since in every case above there is only a single value for a literal, every section that looks like this:

    <xdi:p xri="+(http://www.w3.org/2006/vcard/ns#postal-code)">

      <xdi:xdi>

        <xdi:s xri="$value$hash$sha$256!0a38e8a3c328b1616ac3c34720d0ceb578bd3f5e8bfff9841bb0804dd4d2b5eb">

          <xdi:p xri="$value">

            <xdi:data><![CDATA[55555-1234]]></xdi:data>

          </xdi:p>

        </xdi:s>

      </xdi:xdi>

    </xdi:p>

...should look like this:

<xdi:p xri="+(http://www.w3.org/2006/vcard/ns#postal-code)">

  <xdi:data><![CDATA[55555-1234]]></xdi:data> <-- Drummond/Markus please verify

</xdi:p>

Paul, sorry I missed this. Yes, the <xdi:data> tags are correct XDI XML serialization syntax for expressing a literal. However what I can't comment on is the use of the CDATA format. I'm pretty sure Markus did that because the XDI serializer has no way of knowing whether the value for a literal contains XML markup characters, and thus the only way to make sure they do not interfere with the XML serialization is to encapsulate them in a CDATA structure. But for many XDI literals that would not be necessary, in other words, it could look like this:

<xdi:p xri="+(http://www.w3.org/2006/vcard/ns#postal-code)">

  <xdi:data>55555-1234</xdi:data>

</xdi:p>

The only requirement for the serialization code to produce this is to know that the literal value is "XML safe".

Hope this helps,

=Drummond