*** Identifiers

1
Identifiers

• Identify a value in a model by its path
• Resolve to a unique value (or array ?)
• Can be read directly from the model
• Apply to UML and XML based models

2
ADQL Queries

• SELECT black.box1, black.box2 WHERE ...
• No FROM / No Region / No ???
• Delimiter or Domain name ?
• black.box1 (or _at__at_ ??)
• .black.box1 or black.box1

3
Hierarchical Example

• tables
• table _at_type
• name
• columns
• column _at_type
• name
• column ...
• table ...

4
uTypes Style

• dbtables.table
• dbtables.table.name
• dbtables.table(0).name
• dbtables.table(0)_at_type

5
XPath Style

• tables/table
• tables/table/name
• tables/table/_at_type
• tables/table0/name
• tables/table/_at_xsitype

6
Apache Commons

• tables.table
• tables.table.name
• tables.table(0).name
• tables.table(0)_at_type
• tables.table(4).columns.column.name
• tables.table(4).columns.column(2).name

7
Required Elements

• Element separator gt .
• Attribute identifier gt _at_
• Iteration sequence gt (n)
• Namespace support gt ns
• Fixed and registered ?

8
VOTable Results

• If array resolving identifiers are allowed
• Delimiter ? (_at_ ?)
• Standard space delimiter works only for
  numeric and token values
• Groups ? Sub-table ? Ref-table ?

9
Extra Filtering

• Column name of the images table ?
• vortablenameimages.column.name
• vortablenameimages.column(2).name
• vortablenameimages.columnucdpos.eq.ra.n
  ame
• URL endpoint of the SSA capability ?
• vorcapability_at_standardIDivo//ivoa.net/std/SSA
  .interface.accessURL
• vorcapability_at_xsitypeSimpleSpectralAccess.i
  nterface.accessURL(0)