[vodml] ReferableElement name element

[Gerard Lemson]

Hi Mark
Thanks for the observation, I'll follow this up asap.
Cheers
Gerard

> -----Original Message-----
> From: dm-bounces at ivoa.net [mailto:dm-bounces at ivoa.net] On Behalf Of
> CresitelloDittmar, Mark
> Sent: Tuesday, January 12, 2016 5:41 PM
> To: Data Models mailing list <dm at ivoa.net>
> Subject: [vodml] ReferableElement name element
> 
> Gerard,
> 
> 
> Separate, but related note/question from the EnumLiteral thread.
> 
> There you said:
>   "However, even when adding vodml-id-s explicitly to enum literals in the UML,
> there remains the problem s.
> In VO-DML.xsd EnumLiteral extends ReferableElement, and does not add
> anything to it. The @name attribute inherited fro ReferableElement is supposed
> to represent the literal value. Problem is that @name is restricted as well,
> namely by the VODMLName pattern '[a-zA-Z_][\w_]*'."
> 
> 
> I didn't notice the pattern in the document (by expression or VODMLName), so I
> did some tracking.
> 
> 
> VO-DML - Section 4.1: ReferableElement
> 
>   4.1.2 name: xsd:NCName[1]
>      The name of the model element. Should be an NCName as defined by the
> XML schema specification[24]
> 
> 
> I followed this:
>    http://www.w3.org/TR/xmlschema-2/
> 
> 
> Which defines NCName as:
>   The ·value space· <http://www.w3.org/TR/xmlschema-2/#dt-value-space>  of
> NCName is the set of all strings which ·match·
> <http://www.w3.org/TR/xmlschema-2/#dt-match>  the NCName
> <http://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-NCName>
> production of [Namespaces in XML] <http://www.w3.org/TR/xmlschema-
> 2/#XMLNS> .
> 
> 
> [4] 	NCName	 ::= 	(Letter <http://www.w3.org/TR/REC-xml#NT-
> Letter>  | '_') (NCNameChar <http://www.w3.org/TR/1999/REC-xml-names-
> 19990114/#NT-NCNameChar> )*	/* 	An XML Name
> <http://www.w3.org/TR/REC-xml#NT-Name> , minus the ":" */
> [5] 	NCNameChar	 ::= 	Letter <http://www.w3.org/TR/REC-xml#NT-
> Letter>  | Digit <http://www.w3.org/TR/REC-xml#NT-Digit>  | '.' | '-' | '_' |
> CombiningChar <http://www.w3.org/TR/REC-xml#NT-CombiningChar>  |
> Extender <http://www.w3.org/TR/REC-xml#NT-Extender>
> 
> Which lead to some nasty looking tables of "[#x0041-#x005A]" type stuff.
> 
> 
> So, switching to google, I found this:
> http://stackoverflow.com/questions/1631396/what-is-an-xsncname-type-and-
> when-should-it-be-used
> "Practical restrictions of an NCName
>    The practical restrictions of NCName are that it cannot contain several symbol
> characters like :, @, $, %, &, /, +, ,, ;, whitespace characters or different
> parenthesis. Furthermore an NCName cannot begin with a number, dot or minus
> character although they can appear later in an NCName."
> 
> 
> Which seems to match the expressions shown.
> 
> 
> This doesn't quite match the VODMLName pattern [a-zA-Z_][\w_]*
> 
> Namely, by the inclusion of dot or minus within the NCName.. which (btw)
> would make "X-ray" a valid name.
> 
> I'll note here, that this statement does not effect the discussion regrading the
> EnumLiteral name vs label,
> 
> but is related to the definition of ReferableElement.name in the vo-dml
> document.
> 
> 
> Mark
>