| **Navigation:**  [[introduction.htm|Language Reference]] > 4 - Entity Declarations > File Structures >====== File Structures ====== | [[interface class behavior definition 1.htm|{{btn_prev_n.gif|Previous page}}]][[introduction.htm|{{btn_home_n.gif|Return to chapter overview}}]][[file declare a data file structure .htm|{{btn_next_n.gif|Next page}}]] | | || [[file declare a data file structure .htm|FILE (declare a data file structure)]] [[index declare static file access index .htm|INDEX (declare static file access index)]] [[key declare dynamic file access index .htm|KEY (declare dynamic file access index)]] [[memo declare a text field .htm|MEMO (declare a text field)]] [[blob declare a variable length field .htm|BLOB (declare a variable-length field)]] [[record declare record structure .htm|RECORD (declare record structure)]] [[null data processing.htm|Null Data Processing]] [[file structure properties.htm|FILE Structure Properties]] [[internationalization.htm|Environment Files]]