{
  "name": "is_attribute_valid",
  "type": "function",
  "groups": ["Record and Attributes"],
  "description": "Returns TRUE if a specific feature attribute meets all constraints.",
  "arguments": [{
    "arg": "attribute",
    "description": "an attribute name"
  },{
    "arg": "feature",
    "description": "A feature. If not set, the feature attached to the expression context will be used.",
    "optional": true
  },{
    "arg": "layer",
    "description": "A vector layer. If not set, the layer attached to the expression context will be used.",
    "optional": true
  },{
    "arg": "strength",
    "description": "Set to 'hard' or 'soft' to narrow down to a specific constraint type. If not set, the function will return FALSE if either a hard or a soft constraint fails.",
    "optional": true
  }],
  "examples": [{
    "expression": "is_attribute_valid('HECTARES')",
    "returns": "TRUE"
  }, {
    "expression": "is_attribute_valid('HOUSES',get_feature('my_layer', 'FID', 10), 'my_layer')",
    "returns": "FALSE"
  }],
  "tags": ["constraints", "hard", "soft"]
}