[dsdl-discuss] Comparison of "prune", "cover", "dummy", and "delve"

This mail is an attempt to clarify some of the semantics of the CD of
DSDL Part 4, MNS, and Namespace Switchboard.

As an example, consider a document as below:

<foo:a>
  <bar:b>
    <bar:c/>
    <foo:d/>
    <bar:e>
      <foo:f>
      </foo:f>
    </bar:e>
  </bar:b>
  <bar:f/>
</foo:a>

From this document, we can create a different number of validation
candidates by specifying different schemas in the CD, MNS or Namespace
Switchboard. Let us consider first validation candidate. It is
certainly rooted by <foo:a>. But what is the content of this element?
I see three options.

Option 1: As is

<foo:a>
  <bar:b>
    <bar:c/>
    <foo:d/>
    <bar:e>
      <foo:f>
      </foo:f>
    </bar:e>
  </bar:b>
  <bar:f/>
</foo:a>

Note: This is the semantics of MNS, when we do not prune the <bar:b>
or <bar:f> elements or we specify "bar" as a covered namespace. This
option is not possible in the Part 4 CD.

Option 2: Replace foreign elements by <foreign/>

By replacing the elements rooted by <bar:b> <bar:f> with dummy
elements, we obtain

<foo:a>
  <dummy namespaceName="http://www.example.com/foo"
         xmlns="http://www.xml.gr.jp/xmlns/dummy"/>
  <dummy namespaceName="http://www.example.com/foo"
         xmlns="http://www.xml.gr.jp/xmlns/dummy"/>
</foo:a>

Note: this is the semantics of the Part 4 CD.

Option 3: Remove foreign elements (as well as their attributes and
          contents)

By removing the elements rooted by <bar:b> and <bar:f>,
we obtain

<foo:a>
</foo:a>

This option is particularly useful, when there is a closed schema and
we cannot change it.

Note: This is the semantics of MNS, when we prune the <bar:b> and
<bar:f> elements. This option is not possible in the Part 4 CD.

Option 4: Recursively remove tags of foreign namespaces

By removing <bar:b>, </bar:b>, <bar:c/>, <bar:e>, </bar:e>, and
<bar:f/>, we obtain

<foo:a>
    <foo:d/>
      <foo:f>
      </foo:f>
</foo:a>

This option is particularly useful, when we handle XForms or XSLT.

Note: In my understanding, this is the semantics of "Namespace
Switchboard" when traversal='delve'.

-- 
MURATA Makoto <murata@hokkaido.email.ne.jp>
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