Paths and Scope

Paths connect values, rules, validation, resources, and error locations.

Path forms

name
database.host
rules[0].field
rules[].field

Use indexed paths for runtime instances and pattern paths for schema/rule definitions.

Scope variables

Variable	Meaning
$root	The whole value tree.
$self	Current scoped item, usually an array row.
$parent	Parent scope.
$item	Current item in an aggregate expression.

Example

{
  scope: 'rules[]',
  watch: ['$self.method'],
  when: '$self.method === "custom"',
  effects: [
    { type: 'required', target: '$self.condition', value: true }
  ]
}

Advice

• Keep paths close to the business model.
• Use scope and $self for array rules.
• Avoid hard-coded indexes in schema-level rules.