alzabo

Alzabo does a number of different tasks centered around a simple schema format for graph databases.

• Defines an .edn schema format, with semantics similar to RDF.
• Tool to convert the CANDEL schema into Alzabo format
• Tool to generate Datomic schemas from Alzabo format
• Tool to generate HTML documentation from Alzabo schemas
• A Clojurescript applet to do autocompletion over Alzabo schemas (appears as part of HTML doc)

Schema format

Schemas are represented as EDN maps. See an example or the schema spec.

:title a string :version a string :kinds a map of kind names (keywords) to kind definitions (see below) :enums A map of enum names (keywords) to sequence of enum values (also keywords, generally namespaced)

A kind definition is a map with attributes: :fields: a map of field names (keywords) to field definitions :doc a string :reference? a boolean indicating that this is a reference class (TODO rather too CANDEL specific, maybe generalize)

A field definition is a map with attributes: :type can be:

• a keyword, either a kind name, a primitive
• a vector of types (defines a Datomic heterogenous tuple)
• a map of the form {:* <type>} (defines a Datomic homogenous tuple) Default is :string :doc a string :cardinality Either :one (default) or :many :unique Either :identity or :value, see Datomic doc for details. :unique-id (deprecated) true means the same as :unique :identity :attribute the datomic or sparql attribute corresponding to the field

The defined primitives are #{:string :boolean :float :double :long :bigint :bigdec :instant :keyword :uuid}.

Installation

To generate documentation, you need graphviz installed. On the Mac, you can do this with

$ brew install graphviz

Usage

Generate and view CANDEL schema

Prerequisites:

• leiningen

• Pret installed as a sibling to Alzabo (TODO update to point to opensource version)

  $ lein launch

Will compile the CANDEL schema to static files, compile the clojurescript code for autocomplete, and open the schema web page.

Or, to use a locally (but possibly out of date) version of the schema:

lein run test/resources/test-config.edn datomic
lein run test/resources/test-config.edn documentation
lein run test/resources/test-config.edn server 

Commands

You can run these commands with lein run <config> <cmd>.

$ lein run documentation 

Generates documentation from the given Alzabo schema file.

$ lein run datomic 

Generates a Datomic schema from the given Alzabo schema file.

$ lein run server

Opens the generated documentation in browser..

Use as a library

Add dependency [org.parkerici/alzabo "1.0.0"] (or whatever the lastest version is)

Example

(ns ...
  (:require [org.parkerici.alzabo.schema :as schema]
            [org.parkerici.alzabo.datomic :as datomic]
			[org.parkerici.alzabo.html :as html]))

;; read in a schema file
(let [schema (schema/read-schema <schema.edn>)]

  ;; write out a Datomic schema
  (datomic/write-schema schema "datomic-schema.edn")

  ;; generate documentation 
  (html/schema->html schema "public/schema" {}))