src/Facebook/InstantArticles/Transformer/Getters/JSONGetter.php [18:43]:
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    protected $attribute;

    public function createFrom($properties)
    {
        if (isset($properties['selector'])) {
            $this->withSelector($properties['selector']);
        }
        if (isset($properties['attribute'])) {
            $this->withAttribute($properties['attribute']);
        }
    }

    /**
     * @param string $attribute
     *
     * @return $this
     */
    public function withAttribute($attribute)
    {
        Type::enforce($attribute, Type::STRING);
        $this->attribute = $attribute;

        return $this;
    }

    public function get($node)
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src/Facebook/InstantArticles/Transformer/Getters/XpathGetter.php [18:43]:
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    protected $attribute;

    public function createFrom($properties)
    {
        if (isset($properties['selector'])) {
            $this->withSelector($properties['selector']);
        }
        if (isset($properties['attribute'])) {
            $this->withAttribute($properties['attribute']);
        }
    }

    /**
     * @param string $attribute
     *
     * @return $this
     */
    public function withAttribute($attribute)
    {
        Type::enforce($attribute, Type::STRING);
        $this->attribute = $attribute;

        return $this;
    }

    public function get($node)
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