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dpavlin |
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The options record contains the complete metadata of a database. |
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It uses tags in the range 800-899. |
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If there is an .opt file for the Db, |
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it contains a plaintext record of database options. |
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Else, from a new-style plaintext database, record 0 is used. |
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However, only the options range 850-899 has persistent properties of a database; |
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other options are stored in record 0 not or only as a hint. |
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Database options fall into several groups: |
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- files and modes |
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- tuning options |
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- charset and collation |
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- field definition |
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- miscellaneous info |
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- named views and index definition |
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* files and modes |
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| tag | Cname | name | description |
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| 800 | DNAME | db | short name of db |
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| 801 | DTYPE | format | aligned, naligned or autoformat (default) |
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| 802 | DRO | ro | if 1/0/absent, open read/write/as of file permissions |
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| 803 | DPATH | dbpath | path to database |
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| 804 | DDUMP | internaldump | (unused) |
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| 811 | DFDT | fdt | path to (traditional) fdt |
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| 810 | DENC | encoding | encoding (character set) of data |
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* field definition |
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The compact field definition as described in |
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> Meta |
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uses field 890. |
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| tag | C-name | name | description |
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| 890 | FDEF | fdef | field definition |
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In a long form, each field, subfield, enum value or other field |
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related information is representated as a record using tags in |
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the range 860-879. |
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C-name is the name of the constant in C code (with prefix OPENISIS_), |
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field is the corresponding field in the struct OpenIsisFd, |
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name is the tags name as it can be used in Fdt-aware environments like Tcl. |
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| tag | C-name | field | name | description |
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| 860 | FDID | id | tag | key: the tag described by this entry |
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| 861 | FDSUB | subf | subfield | key: the subfield described (or absent) |
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| 862 | FDTYPE | type | type | code for field type; see table below |
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| 863 | FDREP | rep | repeatable | whether field is repeatable (0/1) |
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| 864 | FDNUMC | slen | numchilds | number of subfields (redundant) |
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| 865 | FDLEN | len | length | max length or enum value |
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| 866 | FDNAME | name | name | tags identifier name; max 30 |
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| 867 | FDDESC | desc | description | tags verbose name; max 30 |
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| 868 | FDPAT | pat | pattern | pattern for field |
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| 869 | FDDFLT | dflt | default | default value |
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| 870 | FDINFO | info | info | embedded record with additional info |
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| 871 | FDCHLD | subs | children | embedded record for subfields (unused) |
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Tags used to define a database |
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| tag | C-name | name | description |
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| 880 | FDT_LEN | flen | number of embedded FD records |
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| 881 | FDT_FD | fd | embedded FD record with fields 860-879 |
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| 882 | FDT_REC | frec | embedded FDT header record with fields 850-852 |
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For informational purposes, traditional FDT parameters are mapped. |
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| tag | Cnam | description |
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| 850 | DFMT | worksheets from the FDT's W line |
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| 851 | DPFT | printformats from the FDT's F line |
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| 852 | DFST | field selection table from the FDT's S line |
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--- |
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$Id: Options.txt,v 1.3 2003/06/30 09:49:00 kripke Exp $ |
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