| Field | Type | Description
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|---|
| kwid | int, no nulls | Unique record ID number of each keyword. Not user controlled.
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| parent_kwid | int | If this keyword is a pseudo-keyword describing an element of a complex or array data type, the parent_kwid is used to indicate the real FITS keyword of which it is a part.
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| keyword | char, no nulls | Keyword string (true FITS keywords are limited to 8 characters).
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| enum | smallint, no nulls | Valid values are Y, N: if enum is Y, the keyword ends in an integer value and there are N instances of it, where N is controlled by some other ''counter'' keyword.
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| efmt | char | If a keyword is enumerated (enum = Y) then the numeric portion of the keyword name has a format. This field describes that format using fprintf conventions.
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| ctrl_kwid | int | If a keyword is enumerated (enum = Y) then another keyword controls the number of instances of it in each header. The kwid of the controlling keyword goes here.
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| type | char, no nulls | This is the FITS type -- a vague English-language typing -- of the keyword value.
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| minv | float | If the keyword value must fall within a certain range, this is the minimum legitimate value.
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| maxv | float | If the keyword value must fall within a certain range, then this is the maximum legitimate value.
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| delim | char | If the keyword value is a delimited list, as in pixel coordinate regions, this field contains the delimiter character for the list.
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| fmt | varchar | This field indicates the format in which the value is to be printed (or read). The convention is fprintf, not fortran.
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| separ | char | If the keyword value is a tuple (list) of complex or array values, this character is the separator character for the list.
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| units | char | If the keyword value is expressed in known units, store the name of the units (e.g. Angstroms) here.
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| semantics | varchar, no nulls | A brief description of the meaning and/or use of the keyword and value.
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| uri | varchar | If a lengthier description of usage or semantics is accessible online, put the URI here.
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| uid | int |
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| stamp | smalldatetime |
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| iscounter | char | If this flag is Y, the keyword is a counter keyword and controls the appearance of one or more enumerated keywords.
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| context | char | Keywords are arranged into ''contexts'' or groups with a common purpose or frame of reference. For example, keywords specific to one instrument should have a context named after that instrument.
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| defv | char | If the keyword has an understood default value in the event that it is missing from the header, store that value here.
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| nulv | char | If the keyword has an understood null value (when it appears in the header with no value) store that value here.
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| req | char | If the keyword is required (by the FITS standard?) this flag should be Y.
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| access | char | Access is one of: R, W, RW and indicates the readability and/or writability of instrument/telescope control keywords
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| alt_name | varchar | In this field you can store the KTL ''long-name'' string or any other ID or syntax string (e.g. from other FITS dictionaries) that should accompany this keyword
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| comment | varchar | Use this field for a brief comment which you might want appended to the FITS card after the comment delimiter.
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| syb_type | varchar | Sybase storage type of the keyword value.
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