Parsing XML document in PostgreSQL using XPATH? -


is there way parse following xml document in postgresql using xpath obtain desired output

--corrected required output

promotion-id price new-promotion null new-promotion null new-promotion 300

for price element. when run query provided below 300 output. issue query ignores price elements having <price xsi:nil="true"/> structure.

is there way return null result price elements <price xsi:nil="true"/> type structure?

my code like:

with x (select '<promotions xmlns:xsi="http://www.w3.org/2001/xmlschema-instance">     <promotion promotion-id="old-promotion">         <enabled-flag>true</enabled-flag>         <searchable-flag>false</searchable-flag>     </promotion>     <promotion promotion-id="new-promotion">         <enabled-flag>false</enabled-flag>         <searchable-flag>false</searchable-flag>         <exclusivity>no</exclusivity>         <price xsi:nil="true"/>         <price xsi:nil="true"/>         <price>300</price>     </promotion> </promotions>'::xml t ) select unnest(xpath('//price/text()', node))::text  (select unnest(xpath('/promotions/promotion', t)) node x) sub

any suggestions above issue highly appreciated.

the problem there no text extracted first 2 price elements. see discussion. postgresql limited xpath 1.0 need unnest xml fragments , convert them individually text.

with x (select '<promotions xmlns:xsi="http://www.w3.org/2001/xmlschema-instance">     <promotion promotion-id="old-promotion">         <enabled-flag>true</enabled-flag>         <searchable-flag>false</searchable-flag>     </promotion>     <promotion promotion-id="new-promotion">         <enabled-flag>false</enabled-flag>         <searchable-flag>false</searchable-flag>         <exclusivity>no</exclusivity>         <price xsi:nil="true"/>         <price xsi:nil="true"/>         <price>300</price>     </promotion> </promotions>'::xml t ) select (xpath('@promotion-id',node))[1]::text "promotion-id",         (xpath('/price/text()',               unnest(xpath('price',node))        ))[1]::text price   (select unnest(xpath('/promotions/promotion', t)) node x) sub

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