Hi,
Indeed, there are those who have been heard to suggest that providing
attribute defaults in a schema is poor architecture. Maybe the only
reason schema languages offer the feature at all is ultimately an
historic one -- and providing attribute values (even nominally
'default' values) is a transformation, isn't it? Even if your position
is not so extreme, there are certainly occasions not to want to use
the mechanism - and a price to be paid when it is used badly. (Who has
not cursed the HTML document littered with @rect attributes?)
Then too XSLT (back on topic) can mitigate these problems but not (as
MMH implies) solve them, since values declared as schema defaults have
a way of 'reinfecting' documents when you don't really want to see
them.
Cheers, Wendell
On Mon, Nov 14, 2016 at 4:59 AM, Michael Müller-Hillebrand
mmh(_at_)docufy(_dot_)de
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
Am 12.11.2016 um 14:07 schrieb Mukul Gandhi
gandhi(_dot_)mukul(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com>:
The idea I've illustrated is, getting a default value of an attribute from
an XSD Schema document (which is accessible from an XSLT stylesheet in a
schema aware transformation scenario).
Thanks a lot for your comments.
In our situation a default attribute value is not something we want to have
in the DTD or XML Schema, because then it would be stored in the XML
instance sooner or later.
As an example, take e.g. the CALS table cell attributes @rowsep and @colsep:
They may be set to "0" | "1" (or: "no" | "yes") to explicitly turn off or on
the respective cell border. If not set, the settings from the row or colspec
are used. In such a situation a stored default value would not be useful,
because there is an indeterminate third status. But in a certain
transformation you may have an effective default value. That is what we have
been using here.
- Michael
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Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
Eat Your Vegetables
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