uniqueItemProperties.js
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uniqueItemProperties.js
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			'use strict';

			var SCALAR_TYPES = ['number', 'integer', 'string', 'boolean', 'null'];

			module.exports = function defFunc(ajv) {
			defFunc.definition = {
			type: 'array',
			compile: function(keys, parentSchema, it) {
			var equal = it.util.equal;
			var scalar = getScalarKeys(keys, parentSchema);

			return function(data) {
			if (data.length > 1) {
			for (var k=0; k < keys.length; k++) {
			var i, key = keys[k];
			if (scalar[k]) {
			var hash = {};
			for (i = data.length; i--;) {
			if (!data[i] \|\| typeof data[i] != 'object') continue;
			var prop = data[i][key];
			if (prop && typeof prop == 'object') continue;
			if (typeof prop == 'string') prop = '"' + prop;
			if (hash[prop]) return false;
			hash[prop] = true;
			}
			} else {
			for (i = data.length; i--;) {
			if (!data[i] \|\| typeof data[i] != 'object') continue;
			for (var j = i; j--;) {
			if (data[j] && typeof data[j] == 'object' && equal(data[i][key], data[j][key]))
			return false;
			}
			}
			}
			}
			}
			return true;
			};
			},
			metaSchema: {
			type: 'array',
			items: {type: 'string'}
			}
			};

			ajv.addKeyword('uniqueItemProperties', defFunc.definition);
			return ajv;
			};


			function getScalarKeys(keys, schema) {
			return keys.map(function(key) {
			var properties = schema.items && schema.items.properties;
			var propType = properties && properties[key] && properties[key].type;
			return Array.isArray(propType)
			? propType.indexOf('object') < 0 && propType.indexOf('array') < 0
			: SCALAR_TYPES.indexOf(propType) >= 0;
			});
			}