retrieving the max value of all the selects in a page with Xpath - xpath

Question

I want to retrieve max value for each combobox present in a web page, with xpath.
Here is a sample HTML containing several combobox with choices:
<label> <span class="invisible_spoken">Some choice</span>
<select class="select_class">
<option value="0">0</option>
<option value="1" >
1
</option>
<option value="2" >
2
</option>
</select>
</label>
<label> <span class="invisible_spoken">Some choice</span>
<select class="select_class">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</label>
<label> <span class="invisible_spoken">Some choice</span>
<select class="select_class">
<option value="0">0</option>
<option value="1">1</option>
</select>
</label
What I would want to retrieve is the maximum value of each combobox, sample output :
2, 3, 1
I've tried with an expression like :
//table[#id="rooms"]//select[contains(#class, "b_selectbox")]/option[not(//table[#id="rooms"]//select[contains(#class, "b_selectbox")]/option/#value > #value)]/#value
But it is returning just combobox max values of the maximum combo value, in the sample case just 3 that is the highest, in the case there will be two combobox with maximum values equals to 3, then it will return those 2 ...

Answer 1

Xpath Selector for Options with highest value.
//label/select[#class="select_class123"]/option[not(../option/#value > #value)]
o/p: Option elements with highest values.
(//label/select[#class="select_class"]/option[not(../option/#value > #value)])/#value
o/p: 2, 3, 1
Test XML XPath online:
<select class="select_class">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
</select>
<select class="select_class">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select class="select_class">
<option value="0">0</option>
<option value="1">1</option>
</select>