xpath when quotes are in node

David Thielen wrote:
[color=blue]
> I have the following xml:
>
> <root>
> <name>abc "123" xyz</name>
> </root>
>
> When I get an XPathNavigator to root and then call navigator.Evaluate("name
> = \"abc \\\"123\\\" xyz"), I get an XPathException. I also tried \\" and " -
> all throw an exception.[/color]

XPath allows both ' and " as the delimiters to string literals so in C#
a string literal like
"name = 'abc \"123\" xyz'"
should do, the outer " delimits the C#/.NET string, the ' delimits the
XPath string and \" is necessary to escape the double quote in the C#
string literal.

But there can be ugly situations with both ' and " used where you need
to split strings and use concat to build your XPath expression in a
syntactically correct way.


--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

Hello;

But isn't \" an official part of xpath?

My problem is that the xpath statements come from xml so we have <node
attr='xpath'/> and so the xpath is "abc \\\"123\\\" xyz" making an actual
node of.

This works fine in java (dom4j/jaxen) and I assumed this is standard???

--
thanks - dave


"Martin Honnen" wrote:
[color=blue]
>
>
> David Thielen wrote:
>[color=green]
> > I have the following xml:
> >
> > <root>
> > <name>abc "123" xyz</name>
> > </root>
> >
> > When I get an XPathNavigator to root and then call navigator.Evaluate("name
> > = \"abc \\\"123\\\" xyz"), I get an XPathException. I also tried \\" and " -
> > all throw an exception.[/color]
>
> XPath allows both ' and " as the delimiters to string literals so in C#
> a string literal like
> "name = 'abc \"123\" xyz'"
> should do, the outer " delimits the C#/.NET string, the ' delimits the
> XPath string and \" is necessary to escape the double quote in the C#
> string literal.
>
> But there can be ugly situations with both ' and " used where you need
> to split strings and use concat to build your XPath expression in a
> syntactically correct way.
>
>
> --
>
> Martin Honnen --- MVP XML
> http://JavaScript.FAQTs.com/
>[/color]

David Thielen wrote:
[color=blue]
> But isn't \" an official part of xpath?[/color]

As an escape mechanism? No, at least in XPath 1.0 there is no such
escape. You can use ' and " but there is no escape character.
And if the XPath is used inside of an XML document (e.g. an XSLT
stylesheet) then you can use the XML escape mechanisms e.g. &quot;
<xsl:value-of select="&quot;Kibology&quot;" />


--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

Yuck - ok - thanks


--
thanks - dave


"Martin Honnen" wrote:
[color=blue]
>
> David Thielen wrote:
>[color=green]
> > But isn't \" an official part of xpath?[/color]
>
> As an escape mechanism? No, at least in XPath 1.0 there is no such
> escape. You can use ' and " but there is no escape character.
> And if the XPath is used inside of an XML document (e.g. an XSLT
> stylesheet) then you can use the XML escape mechanisms e.g. "
> <xsl:value-of select=""Kibology"" />
>
>
> --
>
> Martin Honnen --- MVP XML
> http://JavaScript.FAQTs.com/
>[/color]