Attribute/value schema

Attribute metadata	Description
`type`	Data type or name of reference Entity
`get`	Attribute getter: `get() {}`
`set`	Attribute setter: `set(value) {}`
`required`	`boolean`, default: `true`
`nullable`	`boolean`, default: `false` for indexes, `true` for other
`index`	`boolean`, default: `false`
`unique`	`boolean`, default: `false`
`delete`	`cascade, restrict, no action, set null, set default`
`update`	`cascade, restrict, no action, set null, set default`
`control`	`string`, UI control name
`lookup`	`{ caption, key, result, type }`
`enum`	`array` possible values
`flag`	`array` possible values
`lookup.type`	`container, link, dictionary, tag, flag, tree`
`lookup.display`	`master detail, list, autocomplete, paged`
`order`	`number`, attribute order
`editable`	`boolean`, editable in UI
`case`	`normal, upper, lower, capitalize, title`
`length`	`number` or `{ min: 'number', max: 'number' }`
`min`	`number`
`max`	`number`
`default`	Value by default
`example`	`string`, example value
`hint`	`string`, user hint for UI
`pattern`	`string`, regular expression
`note`	`string`, comments for developers
`include`	`string`, entity name to be included here

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