Re^2: language selection via libxml

Also need to lose the quotes around $id

"/language/$language/widget[\@ID=$id]"
[download]

Update:
Thanks to choroba's explanations and examples below, this only works by accident, i.e. only if $id is a number.

Here are some different ways of doing it:

"/language/$language/widget[\@ID='$id']"
"/language/$language/widget[attribute::ID='$id']"
qq|/language/$language/widget[\@ID="$id"]|
qq|/language/$language/widget[\@ID='$id']|
qq|/language/$language/widget[attribute::ID="$id"]|
qq|/language/$language/widget[attribute::ID='$id']|
[download]

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Re^3: language selection via libxml by choroba (Cardinal) on Jan 20, 2014 at 12:29 UTC
Not really. String literals must be enclosed in quotes in XPath expressions, and XPath does not know Perl variables (unless you use XML::XSH2). لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply]
Re^4: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 12:41 UTC
With the quotes I get `Scalar found where operator expected near ""/language/$language/widget +[\@ID="$id" String found where operator expected near "$id"]"" syntax error near ""/language/$language/widget[\@ID="$id"` [download] Update: Perhaps I should have said "lose double quotes around $id", though no quotes works for me too: `"/language/$language/widget[\@ID="$id"]" - Error "/language/$language/widget[\@ID='$id']" - OK "/language/$language/widget[\@ID=$id]" - OK` [download]	[reply] [d/l] [select]
Re^5: language selection via libxml by choroba (Cardinal) on Jan 20, 2014 at 13:09 UTC
`"/language/$language/widget[\@ID=$id]" - OK` [download] Well, it is a valid syntax, but the meaning is different: it tries to find a widget whose ID attribute has the same value as the text of the child of `widget` whose name is $id. Barewords are not promoted to strings in XPath. لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ	[reply] [d/l] [select]
Re^6: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 13:21 UTC
Re^7: language selection via libxml by choroba (Cardinal) on Jan 20, 2014 at 13:46 UTC
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Re^5: language selection via libxml by hdb (Monsignor) on Jan 20, 2014 at 12:52 UTC
You need to escape the quotes as well or use single quotes around your string: `$result=$tree->findnodes('/language/$language/widget[@ID="$id"]');` [download]	[reply] [d/l]
Re^6: language selection via libxml by tangent (Parson) on Jan 20, 2014 at 13:20 UTC
Re^7: language selection via libxml by hdb (Monsignor) on Jan 20, 2014 at 13:22 UTC
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