Def models a definition dictionary

DefNamespace models a symbolic namespace of defs

Two dimensional tabular data structure composed of Cols and Rows

HaystackContext defines an environment of defs and data

AbstractDict

Bin is a tag value for a binary file stored on disk rather than in the in-memory record database

CallErr is raised when a server returns an error grid from a client call to a REST operation

Client manages a network connection to a haystack server

Column of a Grid

Geographic coordinate as latitude and longitute in decimal degrees

Read Haystack data in CSV format

Write Haystack data in CSV format

DateSpan models a span of time between two dates

DisabledErr indicates access of a disabled resource

DownErr indicates a communications or networking problem

Etc is the utility methods for Haystack

FaultErr indicates a software or configuration problem

Filter models a declarative predicate for selecting dicts

GridBuilder is used to build up an immutable Grid

HaystackTest provides convenience methods for testing common Haystack data structures

HisItem is a timestamp/value pair

Read Haystack data in JSON format

Write Haystack data in JSON format

Kind provides a type signature for a Haystack data value

NA is the singleton which indicates not available

Number represents a numeric value and an optional Unit

Row of a Grid

Span models a range of time using an inclusive starting timestamp and exclusive ending timestamp

SpanMode enumerates relative or absolute span modes

Symbol is a name to a def in the meta-model namespace

Read Haystack data in Trio format

Write Haystack data in Trio format

UnitErr indicates an operation between two incompatible units

UnknownKindErr when a Kind cannot be resolved or parsed

ValidateErr when a validation fails

XStr is an extended string which is a type name and value encoded as a string

Read Haystack data in Zinc format

Write Haystack data in Zinc format