Information on Service 'Descriptions of known UCDs'

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The UCD resolver uses the metadata in the current Registry to suggest UCDs pertinent to natural language column descriptions. In that, it fulfills a similar function as the CDS UCD builder but uses an entirely different approach.

For a list of all services and tables belonging to this service's resource, see Information on resource 'ucds/ui'

Overview

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This resource is not (directly) published. This can mean that it was deemed too unimportant, for internal use only, or is just a helper for a published service. Equally likely, however, it is under development, abandoned in development or otherwise unfinished. Exercise some caution.

Other services provided on the underlying data include:

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
ucd Ucd A unified content descriptor that describes the scientific content of the column. N/A N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
column_description Column_description A free-text description of the column's contents. N/A N/A

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
ivoid Ivoid The parent resource. N/A N/A 20
table_index Table_index Index of the table this column belongs to. N/A N/A 20
name Name The name of the column. N/A N/A 20
ucd Ucd A unified content descriptor that describes the scientific content of the column. N/A N/A 20
unit Unit The unit associated with all values in the column. N/A N/A 20
utype Utype An identifier for a role in a data model that the data in this column represents. N/A N/A 20
std Std If 1, the meaning and use of this column is reserved and defined by a standard model. If 0, it represents a database-specific column that effectively extends beyond the standard. N/A N/A 20
datatype Datatype The type of the data contained in the column. N/A N/A 20
extended_schema Extended_schema An identifier for the schema that the value given by the extended attribute is drawn from. N/A N/A 20
extended_type Extended_type A custom type for the values this column contains. N/A N/A 20
arraysize Arraysize The shape of the array that constitutes the value, e.g., 4, *, 4*, 5x4, or 5x*, as specified by VOTable. N/A N/A 20
delim Delim The string that is used to delimit elements of an array value when arraysize is not '1'. N/A N/A 20
type_system Type_system The type system used, as a QName with a canonical prefix; this will ususally be one of vs:simpledatatype, vs:votabletype, and vs:taptype. N/A N/A 20
flag Flag Hash-separated keywords representing traits of the column. Recognized values include "indexed", "primary", and "nullable". N/A N/A 20
column_description Column_description A free-text description of the column's contents. N/A N/A 20

Citation Info

VOResource XML (that's something exclusively for VO nerds)