Additional niches properties of products allow studying user preferences and calculating recommendations more accurately. This section describes allowing filling the product feed with niche features of cosmetics and perfumes. 

Case Sensitivity

Cosmetics

The "cosmetics" element must be inside the "offer" element.

<offer ...>
    ...
    <cosmetics>
        ...
    </cosmetics>
</offer>

Gender

The "gender" element must be inside the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <gender>f</gender>
	</cosmetic>
</offer>

Hypoallergenic

The "hypoallergenic" element must be inside the "cosmetics" element and can have the following values:

<offer ...>
    ...
	<cosmetic>
	    <hypoallergenic>1</hypoallergenic>
	</cosmetic>
</offer>

Skin

The "skin" element must be inside the "cosmetics" element.

<offer ...>
    <cosmetics>
       ...
        <skin>
            ...
        </skin>
    </cosmetics>
</offer>

Type (skin)

The "type" elements must be inside the "skin" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <skin>
			<type>normal</type>
			<type>dry</type>
		</skin>
	</cosmetic>
</offer>

Condition (skin)

The "condition" elements must be inside the "skin" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <skin>
			<condition>sensitive</condition>
			<condition>fading</condition>
		</skin>
	</cosmetic>
</offer>

Part

The "part" elements must be inside the "skin" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <skin>
			<part>face</part>
			<part>body</part>
		</skin>
	</cosmetic>
</offer>

Hair

The "hair" element must be inside the "cosmetics" element.

<offer ...>
    <cosmetics>
       ...
        <hair>
            ...
        </hair>
    </cosmetics>
</offer>

Type (hair)

The "type" elements must be inside the "hair" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <hair>
			<type>normal</type>
			<type>oily</type>
		</hair>
	</cosmetic>
</offer>

Condition (hair)

The "condition" elements must be inside the "hair" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <hair>
			<condition>colored</condition>
			<condition>damaged</condition>
		</hair>
	</cosmetic>
</offer>

Nail

The "nail" element must be inside the "cosmetics" element.

<offer ...>
    ...
    <cosmetics>
        <nail>
            ...
        </nail>
    <cosmetics>
</offer>

Type (nail)

The "type" elements must be inside the "nail" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <nail>
			<type>tool</type>
		</nail>
	</cosmetic>
</offer>

Polish Color

The "polish_color" element must be inside the "nail" element of the "cosmetics" element and can have any value describing the color of the nail polish.

<offer ...>
    ...
	<cosmetic>
	    <nail>
			<type>polish</type>
            <polish_color>red</polish_color>
		</nail>
	</cosmetic>
</offer>

Perfume

The "perfume" element must be inside the "cosmetics" element.

<offer ...>
    ...
    <cosmetics>
        <perfume>
            ...
        </perfume>
    <cosmetics>
</offer>

Family

The "family" element must be inside the "perfume" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <perfume>
			<family>woody</family>
		</perfume>
	</cosmetic>
</offer>

Aroma

The "aroma" element must be inside the "perfume" element of the "cosmetics" element and can have one of the following values:

<offer ...>
    ...
	<cosmetic>
	    <perfume>
			<family>woody</family>
            <aroma>mossy_woods</aroma> 
		</perfume>
	</cosmetic>
</offer>

Volume

The "volume" elements must be inside the "volumes" element of the "cosmetics" element. Each "volume" element must contain the "value" and "price" elements:

<offer ...>
    ...
	<cosmetic>
		<volumes>
 			<volume>
    			<value>200</value>
				<price>1000</price>
  			</volume>
			<volume>
    			<value>400</value>
				<price>2000</price>
  			</volume>
		</volumes>
	</cosmetic>
</offer>

Periodic

The "periodic" element must be inside the "cosmetics" element and can have the following values:

<offer ...>
    ...
	<cosmetic>
	    <periodic>1</periodic>
	</cosmetic>
</offer>

Professional

The "professional" element must be inside the "cosmetics" element and can have the following values:

<offer ...>
    ...
	<cosmetic>
	    <professional>1</professional>
	</cosmetic>
</offer>