SSA xs ssa XML Schema used to describe the capabilities of a service instance conforming to the Simple Spectral Access (SSA) protocol. An abstract capability that fixes the standardID to the IVOA ID for the SSA standard. See vr:Capability for documentation on inherited children. The capabilities of an SSA service implementation. The category indicating the level to which this instance complies with the SSA standard. Allowed values are "query", "minimal", and "full". See definitions of allowed values for details. The category specifying where the data originally came from. Allowed values are "survey", "pointed", "custom", "theory", "artificial" The category that describes the process used to produce the dataset. Typically this describes only the processing performed by the data service, but it could describe some additional earlier processing as well, e.g., if data is partially precomputed. Allowed values are "archival", "cutout", "filtered", "mosaic", "projection", "spectralExtraction", "catalogExtraction" The largest search radius, in degrees, that will be accepted by the service without returning an error condition. Use 180.0 if there is no restriction. The hard limit on the largest number of records that the query operation will return in a single response The largest number of records that the service will return when the MAXREC parameter not specified in the query input. The largest aperture that can be supported upon request via the APERTURE input parameter by a service that supports the special extraction creation method. A value of 180 (the default) means there is no theoretical limit. The maximum image file size in bytes. a set of query parameters that is expected to produce at least one matched record which can be used to test the service. The allowed values for indicating the level at which a service instance complies with the SSA standard. The service supports all of the capabilities and features of the SSA protocol identified as "must" in the specification, except that it does not support returning data in at least one SSA-compliant format. This level represents the lowest level of compliance. The service supports all of the capabilities and features of the SSA protocol identified as "must" in the specification. In brief, this includes: * implementing the GET interface, * support the parameters POS, SIZE, TOME, BAND, and FORMAT * includes all mandatory metadata fields in query response * supports getData method retrieval in at least one SSA-compliant format * supports the "FORMAT=METADATA" metadata query. This level represents the middle level of compliance. The service supports all of the capabilities and features of the SSA protocol identified as "must" or "should" in the specification. This level represents the highest level of compliance. The defined categories that specify where the spectral data originally came from. A survey dataset, which typically covers some region of observational parameter space in a uniform fashion, with as complete as possible coverage in the region of parameter space observed. A pointed observation of a particular astronomical object or field. Typically, these are instrumental observations taken as part of some PI observing program. The data quality and characteristics may be variable, but the observations of a particular object or field may be more extensive than for a survey. Data which has been custom processed, e.g., as part of a specific research project. Theory data, or any data generated from a theoretical model, for example a synthetic spectrum. Artificial or simulated data. This is similar to theory data but need not be based on a physical model, and is often used for testing purposes. The entire archival or project dataset is returned. Transformations such as metadata or data model mediation or format conversions may take place, but the content of the dataset is not substantially modified (e.g., all the data is returned and the sample values are not modified). The dataset is subsetted in some region of parameter space to produce a subset dataset. Sample values are not modified, e.g., cutouts could be recombined to reconstitute the original dataset. The data is filtered in some fashion to exclude portions of the dataset, e.g., passing only data in selected regions along a measurement axis, or processing the data in a way which recomputes the sample values, e.g., due to interpolation or flux transformation. Filtering is often combined with other forms of processing, e.g., projection. Data from multiple non- or partially-overlapping datasets are combined to produce a new dataset. Data is geometrically warped or dimensionally reduced by projecting through a multidimensional dataset. Extraction of a spectrum from another dataset, e.g., extraction of a spectrum from a spectral data cube through a simulated aperture. Extraction of a catalog of some form from another dataset, e.g., extraction of a source catalog from an image, or extraction of a line list catalog from a spectrum (not valid for a SSA service). A query to be sent to the service the center position the search cone given in decimal degrees. the size of the search radius. Fully specified test query formatted as an URL argument list in the syntax specified by the SSA standard. The list must exclude the REQUEST argument which is assumed to be set to "queryData". This value must be in the form of name=value pairs delimited with apersands (&). A query may then be formed by appending to the base URL the request argument, "REQUEST=queryData&", followed by the contents of this element. a position in the sky to search. The longitude (e.g. Right Ascension) of the center of the search position in decimal degrees. The latitude (e.g. Declination) of the center of the search position in decimal degrees. the coordinate system reference frame name indicating the frame to assume for the given position. If not provided, ICRS is assumed. The capabilities of an proto-SSA service implementation. Clients may assume a particular interface for this type of service based on historical convention; however, no guarantees are made that the service is compliant with any IVOA standard. This capability is for spectral access services developed prior to the completion of the SSA standard and, therefore, are not compliant with that standard. The category specifying where the data originally came from. Allowed values are "survey", "pointed", "custom", "theory", "artificial" The category that describes the process used to produce the dataset. Typically this describes only the processing performed by the data service, but it could describe some additional earlier processing as well, e.g., if data is partially precomputed. Allowed values are "archival", "cutout", "filtered", "mosaic", "projection", "spectralExtraction", "catalogExtraction" The largest search radius, in degrees, that will be accepted by the service without returning an error condition. Use 180.0 if there is no restriction. The hard limit on the largest number of records that the query operation will return in a single response The largest number of records that the service will return when the MAXREC parameter not specified in the query input. The largest aperture that can be supported upon request via the APERTURE input parameter by a service that supports the special extraction creation method. A value of 180 (the default) means there is no theoretical limit. The maximum image file size in bytes. a set of query parameters that is expected to produce at least one matched record which can be used to test the service.