RE: [xml-dev] RE: Word of the day: upconversion

["Jim Tivy" <jimt@bluestream.com>]

Nicely put Roger - "XML" (the full XML family) is really impressive for
making things machine readable.

-----Original Message-----
From: Costello, Roger L. [mailto:costello@mitre.org] 
Sent: Friday, August 21, 2009 12:11 PM
To: 'xml-dev@lists.xml.org'
Subject: [xml-dev] RE: Word of the day: upconversion

 
Hi Folks,

Great comments!  Thank you!

Here's a follow on question ...

Below are two ways of expressing the constraint on a <Color> element. The
first uses XML to express the constraint and the second uses XPath.


1. XML

    <element name="Color">
        <simpleType>
            <restriction base="string">
                <enumeration value="red" />
                <enumeration value="green" />
                <enumeration value="blue" />
            </restriction>
        </simpleType>
    </element>


2. XPath

    <element name="Color">
        <complexType>
            <simpleContent>
                <extension base="string">
                    <assert test="(. eq 'red') or (. eq 'green') or (. eq
'blue')" />
                </extension>
            </simpleContent>
        </complexType>
    </element>


Note: the second uses the new assertion capability in XML Schema 1.1. It
uses XPath to express constraints.


If you're doing upconversion, would you upconvert this XML:

    <enumeration value="red" />
    <enumeration value="green" />
    <enumeration value="blue" />

to this XPath:

    (. eq 'red') or (. eq 'green') or (. eq 'blue')

or vice versa?

Is the XML richer in structure and information or is the XPath?

/Roger

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