Here are the classes, structs, unions and interfaces with brief descriptions:
[detail level 12]
  Xapian | The Xapian namespace contains public interfaces for the Xapian library |
  Auto | Database factory functions which determine the database type automatically |
| Brass | Database factory functions for the brass backend |
| Chert | Database factory functions for the chert backend |
| Flint | Database factory functions for the flint backend |
| InMemory | Database factory functions for the inmemory backend |
| Remote | Database factory functions for the remote backend |
| Unicode | Functions associated with handling Unicode characters |
 Error | All exceptions thrown by Xapian are subclasses of Xapian::Error |
| LogicError | The base class for exceptions indicating errors in the program logic |
| RuntimeError | The base class for exceptions indicating errors only detectable at runtime |
| AssertionError | AssertionError is thrown if a logical assertion inside Xapian fails |
| InvalidArgumentError | InvalidArgumentError indicates an invalid parameter value was passed to the API |
| InvalidOperationError | InvalidOperationError indicates the API was used in an invalid way |
| UnimplementedError | UnimplementedError indicates an attempt to use an unimplemented feature |
| DatabaseError | DatabaseError indicates some sort of database related error |
| DatabaseCorruptError | DatabaseCorruptError indicates database corruption was detected |
| DatabaseCreateError | DatabaseCreateError indicates a failure to create a database |
| DatabaseLockError | DatabaseLockError indicates failure to lock a database |
| DatabaseModifiedError | DatabaseModifiedError indicates a database was modified |
| DatabaseOpeningError | DatabaseOpeningError indicates failure to open a database |
| DatabaseVersionError | DatabaseVersionError indicates that a database is in an unsupported format |
| DocNotFoundError | Indicates an attempt to access a document not present in the database |
| FeatureUnavailableError | Indicates an attempt to use a feature which is unavailable |
| InternalError | InternalError indicates a runtime problem of some sort |
| NetworkError | Indicates a problem communicating with a remote database |
| NetworkTimeoutError | Indicates a timeout expired while communicating with a remote database |
| QueryParserError | Indicates a query string can't be parsed |
| SerialisationError | Indicates an error in the std::string serialisation of an object |
| RangeError | RangeError indicates an attempt to access outside the bounds of a container |
| Compactor | Compact a database, or merge and compact several |
| Database | This class is used to access a database, or a group of databases |
| WritableDatabase | This class provides read/write access to a database |
| Document | A handle representing a document in a Xapian database |
| MSet | A match set (MSet) |
| MSetIterator | An iterator pointing to items in an MSet |
| ESet | Class representing an ordered set of expand terms (an ESet) |
| ESetIterator | Iterate through terms in the ESet |
| RSet | A relevance set (R-Set) |
| MatchDecider | Base class for matcher decision functor |
| Enquire | This class provides an interface to the information retrieval system for the purpose of searching |
| ErrorHandler | Decide if a Xapian::Error exception should be ignored |
| ExpandDecider | Virtual base class for expand decider functor |
| ExpandDeciderAnd | ExpandDecider subclass which rejects terms using two ExpandDeciders |
| ExpandDeciderFilterTerms | ExpandDecider subclass which rejects terms in a specified list |
| KeyMaker | Virtual base class for key making functors |
| MultiValueKeyMaker | KeyMaker subclass which combines several values |
| Sorter | Virtual base class for sorter functor |
| MultiValueSorter | Sorter subclass which sorts by a several values |
| MatchSpy | Abstract base class for match spies |
| ValueCountMatchSpy | Class for counting the frequencies of values in the matching documents |
| PositionIterator | An iterator pointing to items in a list of positions |
| PostingIterator | An iterator pointing to items in a list of postings |
| PostingSource | Base class which provides an "external" source of postings |
| ValuePostingSource | A posting source which generates weights from a value slot |
| ValueWeightPostingSource | A posting source which reads weights from a value slot |
| DecreasingValueWeightPostingSource | Read weights from a value which is known to decrease as docid increases |
| ValueMapPostingSource | A posting source which looks up weights in a map using values as the key |
| FixedWeightPostingSource | A posting source which returns a fixed weight for all documents |
| Query | Class representing a query |
| Stopper | Base class for stop-word decision functor |
| SimpleStopper | Simple implementation of Stopper class - this will suit most users |
| ValueRangeProcessor | Base class for value range processors |
| StringValueRangeProcessor | Handle a string range |
| DateValueRangeProcessor | Handle a date range |
| NumberValueRangeProcessor | Handle a number range |
| QueryParser | Build a Xapian::Query object from a user query string |
| Registry | Registry for user subclasses |
| StemImplementation | Class representing a stemming algorithm implementation |
| Stem | Class representing a stemming algorithm |
| TermGenerator | Parses a piece of text and generate terms |
| TermIterator | An iterator pointing to items in a list of terms |
| Utf8Iterator | An iterator which returns Unicode character values from a UTF-8 encoded string |
| ValueIterator | Class for iterating over document values |
| ValueSetMatchDecider | MatchDecider filtering results based on whether document values are in a user-defined set |
| Weight | Abstract base class for weighting schemes |
| BoolWeight | Class implementing a "boolean" weighting scheme |
| BM25Weight | Xapian::Weight subclass implementing the BM25 probabilistic formula |
 TradWeight | Xapian::Weight subclass implementing the traditional probabilistic formula |