Re: XML Serialization Framework: xml:lang and xml:base

Dear Thomas,

Thank you for your feedback. See our answers in-lined.

Thomas Krekeler wrote 2 November 2009:
 >
 > = 'type' attribute for 'Const' =
 > The list in [1] contains
 > - Const     (individual, function, or predicate symbol, with optional 
'type'
 > attribute)
 > On the other hand the XSD schema ([2]) explicitly defines the 'type'
 > attribute to be required.

You are right, the type information is mandatory for RIF constants. We 
have corrected that. Thank you for spotting the mistake.
 
 > = Locator in an Import Directive =
 > The XSD schema ([2]) element 'location' refers to 'LOCATOR' which 
contains a
 > 'Const' element.
 > Maybe the XSD schema is out dated since [3] says that a locator is not 
a
 > (rif:iri) constant?
 
The XSD is outdated: the LOCATOR is a literal of type xs:anyURI. This has 
been corrected in Core, BLD and FLD.

 > = xml:lang =
 > The definition of the 'Const' element in [2] refers to the 'xml:lang'
 > attribute.
 > Is this attribute for the reader's information only, or does it affect 
the
 > back transformation from XML syntax to presentation syntax?
 > If so, which of the following XML fragments are valid and what are 
their
 > back transformations?
 > <Const type="&rdf;PlainLiteral" xml:lang="en">abc</Const>
 > <Const type="&rdf;PlainLiteral" xml:lang="en">abc@</Const>
 > <Const type="&rdf;PlainLiteral" xml:lang="en">abc@de</Const>

No, the xml:lang attribute is not only for the reader's information, it 
does affect the back transformation fro mXML to PS. As a consequence, the 
three RIF constants in your example would read as follows in the PS:
"abc@en"^^rdf:plainLiteral
"abc@@en"^^rdf:plainLiteral
"abc@de@en"^^rdf:plainLiteral 

 > = xml:base =
 > The xml:base specification ([4]) does not define on which URIs 
contained in
 > an XML document the resolving mechanism against their base URIs 
applies.
 > What about 
 > * the 'type' attribute of 'Const',
 > * the content of the 'location' element,
 > * the content of the 'Const' element if its type is xsd:anyURI or 
rif:IRI?
 
Relative IRIs are allowed in RIF XML syntax, anywhere IRIs are allowed, 
including constant types, symbol spaces, location, and profile. The 
attribute xml:base is used to make them absolute. An section has been 
added in the RIF-PRD specification to make that explicit. The "base" 
directive in RIF-BLD presentation syntax is mapped to the xml:base 
attribute in the XML Document tag (see section 4.3.2 - mapping of the rule 
language).

 > [1] http://www.w3.org/TR/rif-fld/#XML_for_the_RIF-FLD_Language
 > [2] http://www.w3.org/TR/rif-fld/#Baseline_Schema_Module
 > [3] http://www.w3.org/TR/rif-fld/#Well-formed_Terms_and_Formulas
 > [4] http://www.w3.org/TR/xmlbase/
 
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-The RIF WG

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