xml - xmlstarlet selecting a node with a specific attribute value -


i new of please forgive me if answer totally obvious! have xml document downloaded ncbi , trying extract host information each entry, looks little (but more nested): 

<orgname_mod>     <orgmod>         <orgmod_subtype value="strain">2</orgmod_subtype>         <orgmod_subname>mvs/jiroft.irn/14.15/1[b3]</orgmod_subname>     </orgmod>     <orgmod>         <orgmod_subtype value="nat-host">21</orgmod_subtype>         <orgmod_subname>homo sapiens</orgmod_subname>     </orgmod> </orgname_mod>

i've had success using following:

xml sel -t -v //orgname_mod/orgmod[2]/orgmod_subname -n file.xml

but problem there more or less information in orgmod nodes , host isn't in second position. i've tried every version of try , select host node specifically:

xml sel -t -m //orgmod/orgmod_subtype[@value=nat-host] -v ../orgmod_subname -n file.xml

i want select orgmod_subtype node nat-host attribute , subsequently print sibling (?) orgmod_subname node species name.

any appreciated!

try way:

 //orgmod[orgmod_subtype/@value = 'nat-host']/orgmod_subname/text()

-

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