Issue - 203 - How to define a propertyAlias for a messageType

Status: received
Date added: 15 Apr 2005
Categories: Data handling
Date submitted: 15 April 2005
Submitter: Yuzo Fujishima
Description: Now that we have passed the proposal for Issue 103 with $var.part amendment, currently there is no way to define a property alias for a message type because message part cannot be specified in a query string.

Below are some ideas:

A. Introduce a special variable "source" (or other proper name). Bind $source to the data from which the property value is derived.

Eg.

<propertyAlias propertyName="a:prop"
               messageType="b:msgTyp">
  <query>
    $source.part1/some/element/here
  </query>
</propertyAlias>

B. Consider a variable name in a query as a part name.

Eg.

<propertyAlias propertyName="a:prop"
               messageType="b:msgTyp">
  <query>
    $part1/some/element/here
  </query>
</propertyAlias>

C. Add messagePart attribute to propertyAlias element.

Eg.

<propertyAlias propertyName="a:prop"
               messageType="b:msgTyp"
               messagePart="part1">
  <query>
    /some/element/here
  </query>
</propertyAlias>

(Must a query start with "/"?)
Discussion:

With A, you can write something like concat($source.part1/some/element, $source.part2/another). Also, it is possible to apply the same mechanism to non-message-type sources.

B is similar to A and perhaps simpler. But B is not applicable to non-message-type sources. It is also somewhat inconsistent with representations used for assign, while, switch, and so on.

With C, query can be applied only to one part.
Submitter's proposal: Adopt A above.
Champions: Yuzo Fujishima <fujishima@bc.jp.nec.com>
Changes: 15 Apr 2005 - new issue

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