RE: [Springframework-developer] Simplify typical xml setup syntax

[R.J. L. <rjl...@co...>]

I read in the DTD:

"	As the format is simple, a DTD is sufficient, and there's no need
	for a schema at this point."

... But I thought for the heck of it I would try to come up with a =
schema
that addressed the shortcomings that will be in the DTD if this new =
style of
property tag was introduced. I think I have come up with one =
implementation,
although it seems filled with hacks to get around the shortcomings in =
XSDs.
I only implemented the theoretical discussions from today, so a lot of =
the
tags aren't defined completely - not to mention the fact that I didn't =
test
this implementation; I just relied on my prior experience regarding =
schemas.
It is nasty to look at, but given some tweaking it should be a correct
implementation that covers the two concerns brought up by Winter (it
shouldn't be possible to implement both attribute and element style =
property
values) and Seth (each attribute should be mutually exclusive in the
attribute style property tag).

<xs:element name=3D"bean">
	<xs:complexType>
		<xs:group minOccurs=3D"0" maxOccurs=3D"unbounded">
			<xs:choice>
				<!--
					Hack 1:
					elements with the same name can't
share a 'choice' namespace in
					a schema (or sequence or group for
that matter), so the sequence=20
					tags have to be used to separate
them.
				-->
				<xs:sequence>
					<xs:element name=3D"property"
type=3D"beanAttrStyleProperty"/>
				</xs:sequence>
				<xs:sequence>
					<xs:element name=3D"property"
type=3D"localAttrStyleProperty"/>
				</xs:sequence>
				<xs:sequence>
					<xs:element name=3D"property"
type=3D"valueStyleProperty"/>
				</xs:sequence>
				<xs:sequence>
					<xs:element name=3D"property"
type=3D"elemStyleProperty"/>
				</xs:sequence>
			</xs:choice>
		</xs:group>
	</xs:complexType>
</xs:element>

<!--=20
	Hack 2:
	there is no 'attributeChoice' style tag, so=20
	a different property type has to be hacked out=20
	for each attribute combination (biggest oversight in XSDs I think).
-->

<xs:complexType name=3D"beanAttrStyleProperty">
	<xs:attribute name=3D"ref-bean" type=3D"xs:string"/>=09
</xs:complexType>
<xs:complexType name=3D"localAttrStyleProperty">
	<xs:attribute name=3D"ref-bean" type=3D"xs:string"/>=09
</xs:complexType>
<xs:complexType name=3D"valueAttrStyleProperty">
	<xs:attribute name=3D"value" type=3D"xs:string"/>=09
</xs:complexType>

<xs:complexType name=3D"elemStyleProperty">
	<xs:choice>
		<!--=20
			Hack 1 and Hack 2 Combined:
			Here is another example of the two different hacks
employed=20
			above, this time in a nested (inline) format.
		-->
		<xs:sequence>
			<xs:element name=3D"ref">
				<xs:complexType>
					<xs:attribute name=3D"bean"
type=3D"xs:string"/>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
		<xs:sequence>
			<xs:element name=3D"ref">
				<xs:complexType>
					<xs:attribute name=3D"local"
type=3D"xs:string"/>
				</xs:complexType>
			</xs:element>
		</xs:sequence>
		<xs:element name=3D"value" type=3D"xs:string"/>
	</xs:choice>
</xs:complexType>

---

As I said, this isn't tested - it's really just an academic exercise. =
That
being said, it does look like full schema validation would be possible =
even
though (I don't believe) full DTD validation would be possible.


R.J.
-----Original Message-----
From: spr...@li...
[mailto:spr...@li...] On Behalf =
Of
Seth Ladd
Sent: Thursday, October 07, 2004 1:34 PM
To: spr...@li...
Subject: Re: [Springframework-developer] Simplify typical xml setup =
syntax

On Thu, 7 Oct 2004 15:09:01 +0200, j=FCrgen h=F6ller [ werk3AT ]
<jue...@we...> wrote:
> Another request to simply <property> usage in XML bean definitions:
>=20
>   http://opensource.atlassian.com/projects/spring/browse/SPR-379
>=20
> This time, it's not about considering CDATA inside
<property>...</property> as value, but rather about further attributes =
for
the <property> tag itself:
>=20
>   <property name=3D"user" value=3D"admin"/>
>   <property name=3D"linkFormatter" bean=3D"linkFormatter"/>

+1 on this.  Although, can the DTD say that value OR bean but not both?

Seth


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