The characters that can appear in configuration file keywords and user-defined element names: letters, numbers, spaces, dashes, slashes, apostrophes, and periods.

A unique identifier for each NaturalDocs::SourceDB extension as given out by RegisterExtension().

A string representing the absolute, platform-dependent path to a file.

A string representing a unique image reference.

All the information about a reference that makes it unique encoded into a string.

A scalar which encodes a normalized array of identifier strings representing a full or partially-resolved symbol.

A string representing a topic type as defined in Topics.txt.

A comparable integer representing a version number.