Re: XPath

Hello,

Consider the following XML

?xml version="1.0" encoding="UTF-8"?
Root
Data
ID>1005</ID
Reference
Reference>ABC</Reference
Country>UK</Country
/Reference
Reference
Reference>123</Reference
Country>USA</Country
/Reference
/Data
/Root
Using XPath, I would like to: Select the value of the Reference Node,
Where the ID = 1005, And the Country is USA. The value of the node
would therefore be 123.

I'm not great with XPath, but had a go and got it completely wrong:
XPath = "//Data/[ID ="1005"]/../Reference/[Country="USA"]/Reference"

Should be something like /Root/Data[ID='1005']/Reference[Country='USA']/Reference

Square brackets should apply to the node you're selecting, rather than go
as an independent path element.

BTW it's a logical error to have an element named “Reference” take part as
a grouping node at one place and as a value holder in another. That is, the
semantics should be consistend per element name throughout the document.
One of them'd better be renamed.

(H) Serge

"Serge Baltic" <baltic- (AT) hypersw (DOT) net> wrote

Hello,

Consider the following XML

?xml version="1.0" encoding="UTF-8"?
Root
Data
ID>1005</ID
Reference
Reference>ABC</Reference
Country>UK</Country
/Reference
Reference
Reference>123</Reference
Country>USA</Country
/Reference
/Data
/Root
Using XPath, I would like to: Select the value of the Reference Node,
Where the ID = 1005, And the Country is USA. The value of the node
would therefore be 123.

I'm not great with XPath, but had a go and got it completely wrong:
XPath = "//Data/[ID ="1005"]/../Reference/[Country="USA"]/Reference"

Should be something like
/Root/Data[ID='1005']/Reference[Country='USA']/Reference

Square brackets should apply to the node you're selecting, rather than go
as an independent path element.

BTW it's a logical error to have an element named "Reference" take part as
a grouping node at one place and as a value holder in another. That is,
the
semantics should be consistend per element name throughout the document.
One of them'd better be renamed.

Whilst I agree that naming a child element using the same name as the parent
is a little odd. In what way is it a 'Logical error'? Where can these
logic rules be found?

--
Anthony Jones - MVP ASP/ASP.NET