xidel - How to have always the same number of results in xpath even if some tags are not present? -

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i try crawl data website. target sites not details given. example 1 profile has name, birthday given , other 1 name.

i try grasp tags xidel , xpath work charm, when there wouldnt few tags missing (because detail not present)

so ask solution can fill these notexistant tags empty 1 end set of data same length.

i convert data csv afterwards , when tag missing, data 1 column off.

my xidel requests looks this:

xidel 'http://www.icaec.org/users/index' -f '//section[@id="content-area"]//article//h5/a' -e 'concat("`",join(//div[@id="members-info"]/(h5 | span) | //div[@class="row pic-professionsal-details"]/div[2]/div | //div[@class="row pic-professionsal-details"]/following-sibling::div/div[1]//div,"`;`"),"`")' | sed "s/\"/\\\"/g" | sed "s/\`/\"/g" >> icaec.csv

the xpath expression in question one: 

'concat("`",join(//div[@id="members-info"]/(h5 | span) | //div[@class="row pic-professionsal-details"]/div[2]/div | //div[@class="row pic-professionsal-details"]/following-sibling::div/div[1]//div,"`;`"),"`")'

which more or less concatenation of

//div[@id="members-info"]/(h5 | span) //div[@class="row pic-professionsal-details"]/div[2]/div //div[@class="row pic-professionsal-details"]/following-sibling::div/div[1]//div

xidel supports xpath , xquery 3.0 can create sequences replace missing items default, instance given

<items>   <item>     <foo>foo 1</foo>     <bar>bar 1</bar>   </item>   <item>     <foo>foo 2</foo>   </item>   <item>     <bar>bar 3</bar>   </item> </items>

the xquery 3.0 expression

string-join(//item!string-join(((foo, 'foo default')[1], (bar, 'bar default')[1]), ';'), '&#10;')

outputs

foo 1;bar 1 foo 2;bar default foo default;bar 3

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