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Subject: Re: [sca-assembly] Proposed resolution to issue 14
- From: Mike Edwards <mike_edwards@uk.ibm.com>
- To: "OASIS Assembly" <sca-assembly@lists.oasis-open.org>
- Date: Tue, 22 Apr 2008 10:11:08 +0100
Anish,
A big +1.
Thanks for preparing an excellent writeup.
Yours, Mike.
Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014 Mobile: +44-7802-467431
Email: mike_edwards@uk.ibm.com
Anish Karmarkar <Anish.Karmarkar@oracle.com>
21/04/2008 22:51
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Subject
| [sca-assembly] Proposed resolution to
issue 14 |
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During last week's telcon [1] we discussed issue 14
[2] and decided to
move along the lines of the proposal at [3] with the following
modifications:
1) No defaulting of xsi:type
2) No <value> element in the case of GED in property value specification.
3) make xsi:type optional on the <value> element
4) disallow xsi:type on the <property> element when using the compact
form for simple types.
I took an AI to send a new proposal based on [3] with the four agreed
upon changes. New proposal with the agreed changes is below. I also have
an *additional* proposed modification to that listed below.
-----
SCA property can be defined using the 'type' or the 'element' attribute.
When the 'type' attribute is used, it points to either a XML Schema
simple type or a XML Schema complex type. When the 'element' attribute
is used, it points to a XML Schema global element declaration (GED).
Consequently, a property can be defined using XML Schema simple type,
XML Schema complex type or a XML Schema GED.
* Define a new holder element <value> that can contain a SCA property
value when the property is defined using XML Schema simple or complex type.
* Define a new holder attribute @value that can contain a SCA property
value when the property is defined using XML Schema simple type and has
only one value.
* When a property has multiple values all of them MUST be specified
within the same <property> element. Two sibling <property>
elements with
the same value for the @name attribute is an error.
1) Properties defined using XML Schema simple type:
<property name="currency">
<value xsi:type="xs:string">EURO</value>
<value xsi:type="xs:string">USDolar</value>
</property>
<property name="pi">
<value>3.14159265</value>
</property>
When the property is defined using XML Schema simple type and there is
only one property value to set the following simpler syntax can be used:
<property name="pi" value="3.14159265" />
The two forms: either using the <value> element or the @value attribute
are equivalent.
When using the syntax that contains the @value attribute, the attribute
xsi:type MUST NOT be used on the <property> element to specify the
type
of the SCA property.
When using the syntax that contains the <value> element, the attribute
xsi:type MAY be used on the <value> element to specify the type of
the
SCA property.
2) Properties defined using XML Schema complex type:
<property name="complexFoo">
<value xsi:type="foo:MyComplexType" attr="bar">
<foo:a>AValue</foo:a>
<foo:b>InterestingURI</foo:b>
</value>
<value xsi:type="foo:MyComplexType" attr="zing">
<foo:a>BValue</foo:a>
<foo:b>BoringURI</foo:b>
</value>
</property>
<property name="complexBar">
<value anotherAttr="foo">
<bar:a>TheValue</bar:a>
<bar:b>AnotherInterestingURI</bar:b>
</value>
</property>
The attribute xsi:type MAY be used on the <value> element to specify
the
type of the SCA property.
3) Properties defined using XML Schema GED:
<property name="foo">
<SomeGED ...> ... </SomeGED>
<SomeGED ...> ... </SomeGED>
</property>
<property name="bar">
<SomeOtherGED ...> ... </SomeOtherGED>
</property>
-----
My proposed modification:
This proposal is about how one specifies property values. The properties
themselves are declared somewhere else (typically in componentType).
Given that the properties have to be declared, I don't see a value to
including xsi:type in the examples. A runtime has to validate that the
property value conforms to whatever is specified in the property
declaration, independent of the value of xsi:type (if present). Given
this, I would like to suggest that we remove all mention of xsi:type in
the proposal above (neither encourage or discourage it's use). At the
very least, I don't see a reason to encourage its use.
[thanks to Ashok for convincing me that we don't need xsi:type]
Comments?
-Anish
--
[1] http://lists.oasis-open.org/archives/sca-assembly/200804/msg00060.html
[2] http://www.osoa.org/jira/browse/ASSEMBLY-14
[3] http://lists.oasis-open.org/archives/sca-assembly/200804/msg00033.html
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