[NeXus-definitions-tickets] [NeXusDefinitions] #129: "link" defined incorrectly in nxdl.xsd

[NeXus Base Classes and Instrument Definitions]

#129: "link" defined incorrectly in nxdl.xsd
-------------------------+--------------------------------------------------
 Reporter:  Pete Jemian  |       Owner:  Pete Jemian     
     Type:  defect       |      Status:  new             
 Priority:  major        |   Milestone:  release NXDL 1.0
Component:  NXDL syntax  |    Keywords:                  
-------------------------+--------------------------------------------------
Changes (by Pete Jemian):

  * component:  => NXDL syntax


Old description:

> Presently, the NXDL schema defines a ''link'' (in {{{<xs:group
> name="groupGroup">}}}) as a child element of a {{{<group/>}}}.  This
> means an NXDL specification could have a{{{ <link/>}}} element at the
> same level as a {{{<field/>}}} element.  That's not how we use links in
> NeXus.  Instead, links are used within the ''target'' attribute of a
> {{{<field/>}}}, such as
> {{{
>   <polar_angle target="/NXentry/NXinstrument/NXdetector/polar_angle">
> }}}
>
> My proposition is to change '''nxdl.xsd''':
>  1. remove the existing definition of ''link'' from {{{<xs:group
> name="groupGroup">}}}
>  1. remove the definition of {{{<xs:complexType name="linkType">}}}
>  1. add an optional attribute {{{target}}} to {{{<xs:complexType
> name="fieldType">}}} defined similarly to the existing {{{linkType}}}
> definition.

New description:

 Presently, the NXDL schema defines a ''link'' (in {{{<xs:group
 name="groupGroup">}}}) as a child element of a {{{<group/>}}}.  This means
 an NXDL specification could have a{{{ <link/>}}} element at the same level
 as a {{{<field/>}}} element.  That's not how we use links in NeXus.
 Instead, links are used within the ''target'' attribute of a
 {{{<field/>}}}, such as
 {{{
   <polar_angle target="/NXentry/NXinstrument/NXdetector/polar_angle">
 }}}

 My proposition is to change '''nxdl.xsd''':
  1. remove the existing definition of ''link'' from {{{<xs:group
 name="groupGroup">}}}
  1. remove the definition of {{{<xs:complexType name="linkType">}}}
  1. add an optional attribute {{{target}}} to {{{<xs:complexType
 name="fieldType">}}} defined similarly to the existing {{{linkType}}}
 definition.

--

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Ticket URL: <http://trac.nexusformat.org/definitions/ticket/129#comment:3>
NeXus Base Classes and Instrument Definitions <http://www.nexusformat.org/>
NeXus Base Classes and Instrument Definitions