sql - Modify XML values identified through cross apply -

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i've got data issue values stored in xml column in database. i've reproduced problem following example:

setup script:

create table xmltest (     [xml] xml )  --a row 2 duff entries insert xmltest values ('     <root>         <item>             <flag>false</flag>             <frac>0.5</frac>         </item>         <item>             <flag>false</flag>             <frac>0</frac>         </item>         <item>             <flag>false</flag>             <frac>0.5</frac>         </item>              <item>             <flag>true</flag>             <frac>0.5</frac>         </item>     </root>     ')

in xml portion incorrect entries <flag>false</flag> , <frac>0.5</frac> value of flag should true non-zero frac values.

the following sql identifies xml item nodes require update:

select     i.query('.')     xmltest     cross apply xml.nodes('root/item[flag="false" , frac > 0]') x(i)

i want update correct these nodes, don't see how modify item elements identified cross apply. saw update looking this:

 update t     set         x.i.modify('replace value of (flag/text())[1] "true"')             xmltest t         cross apply xml.nodes('root/item[flag="false" , frac > 0]') x(i)

however isn't working: error "incorrect syntax near 'modify'".

can done through method?

i know alternative string replace on xml column, don't being bit unsubtle (and i'm not confident wouldn't break things in real-word problem)

it not possible update 1 xml instance in more 1 place @ time have updates in loop until done.

from http://msdn.microsoft.com/en-us/library/ms190675.aspx "expression1: identifies node value updated. must identify single node."

-- while there rows needs updated while exists(select *              xmltest              [xml].exist('root/item[flag="false" , frac > 0]') = 1) begin   -- update first occurence in each xml instance    update xmltest set     [xml].modify('replace value of (root/item[flag="false" , frac > 0]/flag/text())[1] "true"')   xml.exist('root/item[flag="false" , frac > 0]') = 1 end

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