XSLT_For LOOP _exiting from the loop

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XSLT

My input XML :

<Apartment>
<Room number="1"  length="15" Height = "12"/>
<Room number="1"  length="17" Height = "13"/>
<Room number="1"  length="13" Height = "19"/>
<Room number="2"  length="15" Height = "12"/>
<Room number="2"  length="13" Height = "15"/>
</Apartment>

Required Output XML should be


<Room>
<Number>1</Number>
<SizeList>
<Size>
<length>15</length>
<Height>12</Height>
</Size>
<Size>
<length>17</length>
<Height>13</Height>
</Size>
<Size>
<length>13</length>
<Height>19</Height>
</Size>
</SizeList>
<Number>2</Number>
<SizeList>
<Size>
<length>15</length>
<Height>12</Height>
</Size>
<Size>
<length>13</length>
<Height>15</Height>
</Size>
</SizeList>
</Room>

I Used two for loops to achieve this

<xsl:for-each select="//Room>
<Number>
<xsl:value-of select="@Number"/>
// assigning value number to value
<xsl:variable name="val" select="@Number"/>
</Number>
<xsl:for-each select="//Room>
//checking if variable value and number are equal
<xsl:if test="$val = @Number">
<xsl:value-of select="@length"/>
<xsl:value-of select="@height"/>
</xsl:for-each>
</xsl:for-each>

but when I excute it for room number = 1 the sizelist should be two but I get 4 outputs like below

<Room>
<Number>1</Number>
<SizeList>
<Size>
<length>15</length>
<Height>12</Height>
</Size>
<Size>
<length>17</length>
<Height>13</Height>
</Size>
<Size>
<length>13</length>
<Height>19</Height>
</Size>
</SizeList>

<Room>
<Number>1</Number>
<SizeList>
<Size>
<length>15</length>
<Height>12</Height>
</Size>
<Size>
<length>17</length>
<Height>13</Height>
</Size>
<Size>
<length>13</length>
<Height>19</Height>
</Size>
</SizeList>

please help how can i achieve the required output .