[NeXus-tech] "rank" needs to have a range [1..NX_MAXRANK] in nxdl.xsd

[Pete Jemian]

Propose adding optional "minValue" and "maxValue" attributes to "field" 
declarations in NXDL.
This will simplify the declaration of NXfilter.


For example, look in base_classes/NXfilter.nxdl.xml, lines 55-60
    
(http://trac.nexusformat.org/definitions/browser/trunk/base_classes/NXfilter.nxdl.xml)

The "rank" attribute is an integer that should range from 1..32, when 
present.

The translation from metaDTD to NXDL resulted in an enumeration 
structure (that was not fully enumerated either).
This proposed change would be easier to handle (in the conversion from 
NXDL to XML Schema) and validate
by adding "minValue" and "maxValue" attributes (with no default for 
each) to the
"attributeType" in nxdl.xsd.  Then, we can specify a range of acceptable 
values.

The definition of "unit_cell"volume" in NXfilter would change to be:
    <field name="unit_cell_volume" type="NX_FLOAT" units="NX_ATOMIC_VOLUME">
        <doc>Unit cell</doc>
        <dimensions>n_comp</dimensions>
        <attribute name="rank" type="NX_INT" minValue="1" maxValue="32" />
    </field>

The change to nxdl.xsd, would be to add between lines 66 & 67:
        <xs:attribute name="minValue" use="optional">
            <xs:simpleType>
                <xs:restriction base="xs:integer" />
            </xs:simpleType>
        </xs:attribute>
        <xs:attribute name="maxValue" use="optional">
            <xs:simpleType>
                <xs:restriction base="xs:integer" />
            </xs:simpleType>
        </xs:attribute>


NX_MAXRANK = 32
    documented at 
http://www.nexusformat.org/Application_Program_Interface#Fortran_90_Interface
    defined in NXmodule.f90


Anyone see problems with this change?

Pete

-- 
----------------------------------------------------------
  Pete R. Jemian, Ph.D.                <jemian at anl.gov>
  Beam line Controls and Data Acquisition, Group Leader
  Advanced Photon Source,   Argonne National Laboratory
  Argonne, IL  60439                   630 - 252 - 3189
-----------------------------------------------------------
     Education is the one thing for which people
        are willing to pay yet not receive.
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