Compare std::vector of pairs with pugi::xml_object_range attributes

I'm writing some convenience functions for my XML parser based on pugixml (http://pugixml.org/), and now I have the problem that I want to retrieve only XML nodes with a specific attribute name and value!

XML example:

<Readers>
    <Reader measurement="..." type="Mighty">
        <IP reader="1">192.168.1.10</Group>
        <IP reader="2">192.168.1.25</Group>
        <IP reader="3">192.168.1.30</Group>
        <IP reader="4">192.168.1.50</Group> 
    </Reader>
    <Reader measurement="..." type="Standard">
        ...
    </Reader>
</Readers>

My try:

std::string GetNodeValue(std::string node, std::vector<std::pair<std::string,std::string>> &attributes)
{
    pugi::xml_node xmlNode = m_xmlDoc.select_single_node(("//" + node).c_str()).node();

    // get all attributes
    pugi::xml_object_range<pugi::xml_attribute_iterator> nodeAttributes(xmlNode.attributes());

    // logic to compare given attribute name:value pairs with parsed ones
    // ...
}

Can someone help me or give me a hint?! (maybe with Lambda Expressions)