'''structured data''' is [data] that is composed of smaller well-defined and
indexable parts.  



** Description **

Structured data may be textually represented via some [data format], and
perhaps stored in a [DBMS].  [data structure%|%Data structures] may be
[serializing%|%serialized] into structured data for purposes of communication
or persistence.



** Systems **

In one sense, any program or script ever written is a system for working with
structured data, but there are also programs dedicated to structuring,
querying, and archiving data.  This is a list of such systems in the Tcl world.
It omits more general [dbms%|%database management systems], and focuses on
systems that provide a more customized interface for processing data.  Also excluded are systems dedicated to [Vector or matrix algebra in Tcl] and [Numerical Analysis in Tcl], which are enumerated on those pages.

   [Speed Tables], by [Karl Lehenbauer]:   Generate [C] code that implements a table data structure and access routines, and use a Tcl interface to create, access and manipulate those tables.

   [TclRAL], by [Andrew Mangogna]:   A Tcl [extension] written in [C] that implements the [relational algebra].

   [tDOM], by [Jochen Loewer] and [Rolf Ade]:   Billed as an [XML] parser, includes an interface to manipulate a DOM tree, and also full XPath processor, making it a formidable system in its own right. 

   [ycl eav], by [PYK]:   An entity-attribute-value system backed by [sqlite] that works something like a hierarchy of dictionaries, but with advanced querying capabilities and processing features such as `trace`.

   [Yggdrasil], by [SDW]:   Provides '''nodes''', '''containers''', and '''typed links'''.  Implemented in [incr Tcl].



** See Also **

   [data structure]:   

   [Compact data storage]:   

   [Data Modelling]:   


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