Extracting data from xml file using xmllint - xml-parsing

Question

I have a small xml document from which I need to extract some values using xmllint. I am able to navigate through the xml hierarchy using xmllint --shell xmlfilename command.
But I am unable to extract the values. I don't want to use a grep / any pattern matching command, as that is already done and is a success.
I would appreciate any help regarding the xmlliint.
Here is my document in png format. I want to extract the 300$ and 500$ (the value).
<?xml version="1`.`0" encoding="ISO-8859-1"?>
<adi>
<asset>
<electronics item="Mobile" name="Nokia" value="300$" />
<electronics item="Mobile" name="Sony" value="500$" />
</asset>
</adi>
Another doubt is, are the two sets, the different representation of same xml ?
<?xml version="1.0 encoding="ISO-8859-1"?>
<adi>
<asset>
<electronics>
<item> Mobile </item>
<name>Nokia</name>
<value>300$</value>
</electronics>
<electronics>
<item> Mobile </item>
<name>Sony</name>
<value>500$</value>
</electronics>
</asset>
</adi>

Answer 1

With regards to your second question, those two snippets do not represent the same XML content. Attributes and child elements are not equivalent. A child element can be the root element of some arbitrary XML tree, but attributes are atomic.
E.g., I could modify the second snippet like this:
<?xml version="1.0 encoding="ISO-8859-1"?>
<adi>
<asset>
<electronics>
<item>
Mobile
<sub-item>Phone</sub-item>
</item>
<name>Nokia</name>
<value>300$</value>
</electronics>
<electronics>
<item> Mobile </item>
<name>Sony</name>
<value>500$</value>
</electronics>
</asset>
</adi>
where I have added <sub-item>Phone</sub-item> to the first <item> element.
However, there's no equivalent if item is an attribute instead, as in the first snippet.

Answer 2

Late but while searches for the tag xmllint match the first page, I answer you now ;)
use --xpath instead of --xpath like below
xmllint --xpath '//electronics/value/text()' second-xml_file.xml