VODataService xs vs An extension to the core resource metadata (VOResource) for describing data collections and services. A logical grouping of data which, in general, is composed of one or more accessible datasets. A collection can contain any combination of images, spectra, catalogs, or other data. (A dataset is a collection of digitally-encoded data that is normally accessible as a single unit, e.g. a file.) Subject the observatory or facility used to collect the data contained or managed by this resource. Subject Subject.Instrument the Instrument used to collect the data contain or managed by a resource. Rights Information about rights held in and over the resource. This should be repeated for all Rights values that apply. The physical or digital manifestation of the information supported by a resource. MIME types should be used for network-retrievable, digital data. Non-MIME type values are used for media that cannot be retrieved over the network--e.g. CDROM, poster, slides, video cassette, etc. Extent of the content of the resource over space, time, and frequency. A description of the tables that are part of this collection. Each schema name and each table name must be unique within this tableset. The URL that can be used to download the data contained in this data collection. A description of how a resource's contents or behavior maps to the sky, to time, and to frequency space, including coverage and resolution. The STC description of the location of the resource's data (or behavior on data) on the sky, in time, and in frequency space, including resolution. In general, this description should be approximate; a more precise description can be provided by the footprint service. a reference to a footprint service for retrieving precise and up-to-date description of coverage. the ivo-id attribute refers to a Service record that describes the Footprint capability. That is, the record will have a capability element describing the service. The resource refered to may be the current one. Coverage.Spectral a named spectral region of the electro-magnetic spectrum that the resource's spectral coverage overlaps with. Coverage.RegionOfRegard a single numeric value representing the angle, given in decimal degrees, by which a positional query against this resource should be "blurred" in order to get an appropriate match. In the case of image repositories, it might refer to a typical field-of-view size, or the primary beam size for radio aperture synthesis data. In the case of object catalogs RoR should normally be the largest of the typical size of the objects, the astrometric errors in the positions, or the resolution of the data. the service URL for a potentially registerd service. That is, if an IVOA identifier is also provided, then the service is described in a registry. The URI form of the IVOA identifier for the service describing the capability refered to by this element. wavelength >= 10 mm; frequency <= 30 GHz. 0.1 mm <= wavelength <= 10 mm; 3000 GHz >= frequency >= 30 GHz. 1 micron <= wavelength <= 100 micons 0.3 microns <= wavelength <= 1 micon; 300 nm <= wavelength <= 1000 nm; 3000 Angstroms <= wavelength <= 10000 Angstroms 0.1 microns <= wavelength <= 0.3 micon; 1000 nm <= wavelength <= 3000 nm; 1000 Angstroms <= wavelength <= 30000 Angstroms 100 Angstroms <= wavelength <= 1000 Angstroms; 12 eV <= energy <= 120 eV 0.1 Angstroms <= wavelength <= 100 Angstroms; 0.12 keV <= energy <= 120 keV energy >= 120 keV The set of tables hosted by a resource. A named description of a set of logically related tables. The name given by the "name" child element must be unique within this TableSet instance. If there is only one schema in this set and/or there's no locally appropriate name to provide, the name can be set to "default". This aggregation does not need to map to an actual database, catalog, or schema, though the publisher may choose to aggregate along such designations, or particular service protocol may recommend it. A detailed description of a logically-related set of tables A name for the set of tables. This is used to uniquely identify the table set among several table sets. If a title is not present, this name can be used for display purposes. If there is no appropriate logical name associated with this set, the name should be explicitly set to "default". a descriptive, human-interpretable name for the table set. This is used for display purposes. There is no requirement regarding uniqueness. It is useful when there are multiple schemas in the context (e.g. within a tableset; otherwise, the resource title could be used instead). A free text description of the tableset that should explain in general how all of the tables are related. an identifier for a concept in a data model that the data in this schema as a whole represent. The format defined in the VOTable standard is strongly recommended. A description of one of the tables that makes up the set. The table names for the table should be unique. if true, then the content is a MIME Type A service for accessing astronomical data Subject the observatory or facility used to collect the data contained or managed by this resource. Subject Subject.Instrument the Instrument used to collect the data contain or managed by a resource. Extent of the content of the resource over space, time, and frequency. A service invoked via an HTTP Query (either Get or Post) with a set of arguments consisting of keyword name-value pairs. Note that the URL for help with this service can be put into the Service/ReferenceURL element. The type of HTTP request, either GET or POST. The service may indicate support for both GET and POST by providing 2 queryType elements, one with GET and one with POST. The MIME type of a document returned in the HTTP response. a description of a input parameter that can be provided as a name=value argument to the service. an ampersand-delimited list of arguments that can be used to test this service interface; when provided as the input to this interface, it will produce a legal, non-null response. When the interface supports GET, then the full query URL is formed by the concatonation of the base URL (given by the accessURL) and the value given by this testQuery element. The type of HTTP request, either GET or POST. A service that interacts with with astronomical data through one or more specified tables. A table with sky coverage typically have columns that give longitude-latitude positions in some coordinate system. A description of the tables that are accessible through this service. Each schema name and each table name must be unique within this tableset. the fully qualified name of the table. This name should include all catalog or schema prefixes needed to sufficiently uniquely distinguish it in a query. In general, the format of the qualified name may depend on the context; however, when the table is intended to be queryable via ADQL, then the catalog and schema qualifiers are delimited from the table name with dots (.). a descriptive, human-interpretable name for the table. This is used for display purposes. There is no requirement regarding uniqueness. a free-text description of the table's contents an identifier for a concept in a data model that the data in this table represent. The format defined in the VOTable standard is highly recommended. a description of a table column. a description of a foreign keys, one or more columns from the current table that can be used to join with another table. a name for the role this table plays. Recognized values include "output", indicating this table is output from a query; "base_table", indicating a table whose records represent the main subjects of its schema; and "view", indicating that the table represents a useful combination or subset of other tables. Other values are allowed. a description of a parameter that places no restriction on the parameter's data type. As the parameter's data type is usually important, schemas normally employ a sub-class of this type (e.g. Param), rather than this type directly. the name of the column a free-text description of the column's contents the unit associated with all values in the column the name of a unified content descriptor that describes the scientific content of the parameter. There are no requirements for compliance with any particular UCD standard. The format of the UCD can be used to distinguish between UCD1, UCD1+, and SIA-UCD. See http://www.ivoa.net/Documents/latest/UCDlist.html for the latest IVOA standard set. an identifier for a concept in a data model that the data in this schema represent. The format defined in the VOTable standard is highly recommended. a description of a table parameter having a fixed data type. The allowed data type names match those supported by VOTable. a type of data contained in the column a keyword representing traits of the column. Recognized values include "indexed", "primary", and "nullable". See the specification document for definitions of recognized keywords. If true, the meaning and use of this parameter is reserved and defined by a standard model. If false, it represents a database-specific parameter that effectively extends beyond the standard. If not provided, then the value is unknown. a description of a service or function parameter having a fixed data type. The allowed data type names do not imply a size or precise format. This type is intended to be sufficient for describing an input parameter to a simple REST service or a function written in a weakly-typed (e.g., scripting) language. a type of data contained in the column An indication of whether this parameter is required to be provided for the application or service to work properly. Allowed values are "required" and "optional". If true, the meaning and behavior of this parameter is reserved and defined by a standard interface. If false, it represents an implementation-specific parameter that effectively extends the behavior of the service or application. the parameter is required for the application or service to work properly. the parameter is optional but supported by the application or service. the parameter is not supported and thus is ignored by the application or service. a type (in the computer language sense) associated with a parameter with an arbitrary name This XML type is used as a parent for defining data types with a restricted set of names. the shape of the array that constitutes the value the default is "1"; i.e. the value is a scalar. the string that is used to delimit elements of an array value when arraysize is not "1". Unless specifically disallowed by the context, applications should allow optional spaces to appear in an actual data value before and after the delimiter (e.g. "1, 5" when delim=","). the default is " "; i.e. the values are delimited by spaces. The data value represented by this type can be interpreted as of a custom type identified by the value of this attribute. If an application does not recognize this extendedType, it should attempt to handle value assuming the type given by the element's value. string is a recommended default type. This element may make use of the extendedSchema attribute and/or any arbitrary (qualified) attribute to refine the identification of the type. An identifier for the schema that the value given by the extended attribute is drawn from. This attribute is normally ignored if the extendedType attribute is not present. An expression of a the shape of a multi-dimensional array of the form LxNxM... where each value between gives the integer length of the array along a dimension. An asterisk (*) as the last dimension of the shape indicates that the length of the last axis is variable or undetermined. a data type restricted to a small set of names which is imprecise as to the format of the individual values. This set is intended for describing simple input parameters to a service or function. an abstract parent for a class of data types that can be used to specify the data type of a table column. a data type supported explicitly by the VOTable format an abstract parent for the specific data types supported by the Table Access Protocol. the length of the fixed-length value This corresponds to the size Column attribute in the TAP_SCHEMA and can be used with data types that are defined with a length (CHAR, BINARY). a data type supported explicitly by the Table Access Protocol (v1.0). a description of standard space-time coordinate systems, positions, and regions. This resource provides a mechanism for registering standard coordinate systems which other resources may reference as part of a coverage descripiton. In particular, coverage descriptions will refer to components of the STC descriptions in this resource via an IVOA identifier. It is intended that an application consuming such coverage descriptions be able to semantically interpret the identifier without resolving it. For this reason, once a standard STC description is registered with this resource type, updating the description is strongly discouraged. An STC description of coordinate systems, positions, and/or regions Each system, position, and region description should have a an XML ID assigned to it. Because the STC schema sets elementFormDefault="qualified", it is recommended that this element specify the STC default namespace via an xmlns namespace. A description of the mapping a foreign key--a set of columns from one table--to columns in another table. This definition that the foreign key is being described within the context of the table containing the key. the fully-qualified name (including catalog and schema, as applicable) of the table that can be joined with the table containing this foreign key. a pair of column names, one from this table and one from the target table that should be used to join the tables in a query. a free-text description of what this key points to and what the relationship means. an identifier for a concept in a data model that the association enabled by this key represents. The format defined in the VOTable standard is highly recommended. A pair of columns that are used to join two tables. To do an inner join of data from the two tables, a query should include a constraint that sets the value from the first column equal to the value in the second column. This type assumes that it is used in the context of implied source (i.e., current) and target tables, as in the ForeignKey type's fkColumn. The unqualified name of the column from the current table. The unqualified name of the column from the target table.