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| valign='top' | '''1. Meta Data'''
| valign='top' | 1. Key/value pairs, suffixed by empty key ({{Type|Token}}/{{Type|Token}}):<br /> • <code>PERM</code> → User PermissionsNumber of users ({{Type|Num}}), and name/password/permission values for each user ({{Type|Token}}/{{Type|Token}}/{{Type|Num}})<br/>2. Empty key as finalizer
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/DiskData.java DiskData()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/MetaData.java MetaData()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/core/Users.java Users()]
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| valign='top' | '''2. Main memory indexes'''
| 1. Key/value pairs, suffixed by empty key ({{Type|Token}}/{{Type|Token}}):<br /> • <code>TAGS</code> → Tag Index<br /> • <code>ATTS</code> → Attribute Name Index<br /> • <code>PATH</code> → Path Index<br /> • <code>NS</code> → Namespaces<br /> • <code>DOCS</code> → Document Index<br/>2. Empty key as finalizer
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/DiskData.java DiskData()]
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| valign='top' | '''2.1. a) Name Index'''<br/>Tag/attribute names
| 1. Token set, storing all names ({{Type|TokenSet}})<br />2. One StatsKey instance per entry:<br/>2.1. Content kind ({{Type|Num}}):<br />2.1.1. Number: min/max ({{Type|Doubles}})<br />2.1.2. Category: number of entries ({{Type|Num}}), entries ({{Type|Tokens}})<br />2.2. Number of entries ({{Type|Num}})<br />2.3. Leaf flag ({{Type|Boolean}})<br />2.4. Maximum text length ({{Type|Double}}; legacy, could be {{Type|Num}})
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/Names.java Names()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/util/hash/TokenSet.java TokenSet.read()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/StatsKey.java StatsKey()]
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| valign='top' | '''2.2. b) Path Index'''
| 1. Flag for path definition ({{Type|Boolean}}, always <code>true</code>; legacy)<br/>2. PathNode:<br/>2.1. Name reference ({{Type|Num}})<br/>2.2. Node kind ({{Type|Num}})<br/>2.3. Number of occurrences ({{Type|Num}})<br/>2.4. Number of children ({{Type|Num}})<br/>2.5. {{Type|Double}}; legacy, can be reused or discarded<br/>2.6. Recursive generation of child nodes (→ 2)
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathSummary.java PathSummary()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/path/PathNode.java PathNode()]
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| valign='top' | '''2.3. c) Namespaces'''
| 1. Token set, storing prefixes ({{Type|TokenSet}})<br/>2. Token set, storing URIs ({{Type|TokenSet}})<br/>3. NSNode:<br/>3.1. pre value ({{Type|Num}})<br/>3.2. References to prefix/URI pairs ({{Type|Nums}})<br/>3.3. Number of children ({{Type|Num}})<br/>3.4. Recursive generation of child nodes (→ 3)
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/Namespaces.java Namespaces()]<br/>[https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/data/NSNode.java NSNode()]
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| valign='top' | '''2.4. d) Document Index'''
| Array of integers, representing the distances between all document pre values ({{Type|Nums}})
| valign='top' | [https://github.com/BaseXdb/basex/blob/master/src/main/java/org/basex/index/DocIndex.java DocIndex()]
