Updated documentation

documentation/product/system/requirements.md

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+The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”,
+“SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be
+interpreted as described in [RFC 2119](https://tools.ietf.org/html/rfc2119).
+
+"entity" or "entities" are to be interpreted as [Doctrine Objects](https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/working-with-objects.html).
+
+# requiremts
+
+## interfaces
+The application MUST contain the following interfaces:
+* HTML
+* JSON
+
+## actors
+
+### user
+The application MUST provide the following functions:
+* delete user
+* register user
+* modify user
+* create user (child)
+* login
+* logout
+
+A user MUST have one node.
+
+A user MUST be a source.
+
+### law
+A law MUST belong exclusive to a node.
+
+A law MUST contain one of each of right types one time.
+
+#### right
+A right MUST NOT be a source.
+
+A right MUST belong to a law.
+
+A right MUST be of one of the following types:
+* read
+* write
+* administrate
+
+#### permission
+A permission MAY have a father from which it inherit.
+
+A permission MUST belong to a right.
+
+A permission MUST allow blacklisting.
+
+A permission MUST allow whitelisting.
+
+A permission MUST allow that it applies to child of collection.
+
+A permission MUST allow that it applies to the parents of the collection.
+
+A permission MUST contain a collection on which the rule set applies.
+
+### node
+A node MUST have one source.
+
+A node MAY contain a parents collection.
+
+A node MAY contain a children collection.
+
+A node MAY be a member of a collection entity.
+
+A node MUST have a law.
+
+A node MUST have a history.
+
+### source
+A source MUST have one node.
+
+A source MUST be an entity.
+
+#### entities
+Sources MUST be on of the following entities:
+
+|entity|attributes|
+--- | --- | ---
+|user|username,password,identity|
+|identity|names,addresses|
+|address||
+|date|datetime|
+|name|string|
+|birthday|date
+|death|date
+|text|varchar
+|collection|nodes
+|live|birthday,death
+
+A source MUST have a file fabric.
+
+#### files
+
+Sources MUST be on of the following files:
+* HTML
+* JSON
+* XML
+* TEXT
+* CSV
+* JPG
+
+It SHOULD be possible to export a file to one or more other files.
+
+It MUST be possible to edit a file.
+
+IT MUST be possible to save a file.
+
+#### collection
+A source MAY contain other nodes.
+
+### history
+A history MUST log all of the actions which happen to a node.
+
+A history MUST exclusive belong to a node.
+
+A history MUST allow to give the state of a node to a special date back.