DefiningServiceParameters < IVOA

IVOA Web>IvoaDAL>DefiningServiceParameters (2023-11-13, BaptisteCecconi) (raw view)

<br /> <!--
      * Set ALLOWTOPICRENAME = IVOA.TWikiAdminGroup
-->

DAL Parameters in 3 factor semantics are uniquely defined by the triple of name, UCD
, and unit.  Data services are free to
support as many such parameters as is appropriate for their datasets, in
addition to supporting standard parameters.  With the three factors, it
is unlikely that two service providers will by accident use the same
three factors for parameters of differing semantics.  

With standard parameters as defined in this document, clients can rely
on certain semantics and exploit that knowledge in the provision of
special UIs or APIs.

Both standard and non-standard parameters should follow DALI conventions
if at all possible.  Roughly, float-valued target fields should be accessed or
constrained via interval-valued parameters (i.e., do not split up
minimum and maximum into separate parameters).  Depending on their
semantics, integer parameters should either be intervals or enumerated
parameters (which typically can be repeated). Geometry fields should be
accessed or constrained using geometry values (circle and polygon xtypes
from DALI, following the examples of CIRCLE
 and POLYGON.

Topic revision: r3 - 2023-11-13 - BaptisteCecconi

IVOA

Log in or Register

IVOA.net
Wiki Home
WebChanges
WebTopicList
WebStatistics

Twiki Meta & Help
IVOA
Know
Main
Sandbox
TWiki

TWiki intro
TWiki tutorial
User registration
Notify me

Working Groups

Interest Groups

Time Domain

Committees

Stds&Procs

www.ivoa.net
Documents
Events
Members
XML Schema