How Habbo is rendering there furnitures?

[jeremsbgx]

Hello,
Sorry for my bad english i'm not a native speaker. I'm creating my own habbo retro in HTML5 for fun, after natively rendering the floor tile and wall i'am doing the furniture part of the retro.
I'm stuck with rendering multiple furniture's part as one. Is someone can explain to me what is the best technique for rendering the furnitures ?

This is what i've tried until now, I have this asset.xml file with contains :

<asset name="rare_royalsofa_64_sd_2_0" x="65" y="16"/>
<asset name="rare_royalsofa_64_a_2_0" x="26" y="46"/>
<asset name="rare_royalsofa_64_b_2_0" x="57" y="46"/>
<asset name="rare_royalsofa_64_c_2_0" x="57" y="13"/>
<asset name="rare_royalsofa_64_d_2_0" x="28" y="-19"/>

Sd is the shadow, and what is the other letters ? what is the X and Y ? Royal Sofa's dimension is : <dimensions x="2" y="1" z="1.1"/>
So I need to take two cell ? How i'am construting the furniture based on the asset's files ? Should I do Cell.X - 65, Cell.Y - 16 for asset 1, Cell.X - 26, Cell.Y - 46 for asset 3 ect.. ?

Thanks !