I'd like to select a node if it has class="something" or class="else". How can I do that? XPath docs don't seem to contain any easy to find boolean or equivalent.
The or operateor is named or and you would use it like //div[#class='something' or #class='else']
It is just or -- not OR or Or.
XPath is case sensitive -- don't forget.
Related
Wrote below Xpath , which to i want extend to include "<", ">=" etc.
//RelationalExpression[#Image=">" and
descendant :: PrimaryExpression/PrimaryPrefix/Name[#Image!="ABC" and #Image!="PQR"]]
Below rule does not give correct result,
//RelationalExpression[#Image=">" or #Image="<" and
descendant :: PrimaryExpression/PrimaryPrefix/Name[#Image!="ABC" and #Image!="PQR"]]
Any solution to correct the check?
In one of the TIBCO Designer .process files I found an expression like this: $SomeValue/text()=0.
What does it mean?
That $SomeValue is null or blank, or what?
Its evaluating the value to a Boolean.. meaning if text() is zero, then the field for which it is mapped becomes true. Generally () are not seen in the xpath values, would be great if you could post the exact statement.
What is the name of the method corresponding to the ternary operator? By name I mean :+ for addition, :== for equality, etc.
I want to override the ternary operator to build a proxy class (same idea as Javascript proxies) but I can't seem to find the name for this.
There are two names that this is known by, if you are talking about the ? : operator, and that is ternary operator or conditional operator.
But it is not a method, as you can see in this table.
You would need to go to Ruby Source itself to override the behavior. Probably not what you would want to do.
I'm pretty sure it's just known as the ternary operator. Usually people know what you mean when you say that, and I've never heard or seen another name, even during research.
If you mean symbol, I'd call it:
?:
(Question mark, Colon)
With XPath, I know that you can use the union operator in the following way:
//*[#id="Catalog"]/thead | //*[#id="Catalog"]/tbody
This seems to be a little awkward to me though. Is there a way to do something similar to one of these instead?
//*[#id="Catalog"]/(thead|tbody)
//*[#id="Catalog"]/(thead or tbody)
//*[#id="Catalog"]/*[nodename="thead" or nodename="tbody"]
That seems a lot more readable and intuitive to me...
While the expression:
//*[#id="Catalog"]/*[name()="thead" or name()="tbody"]
is correct
This expression is more efficient:
//*[#id="Catalog"]/*[self::thead or self::tbody]
There is yet a third way to check if the name of an element is one of a specified sequence of strings:
//*[#id="Catalog"]/*[contains('|thead|tbody|',concat('|',name(),'|'))]
Using this last technique can be especially practical in case the number of possible names is very long (of unlimited and unknown length). The pipe-delimited string of possible names can even be passed as an external parameter to the transformation, which greatly increases its generality, re-usability and "DRY"-ness.
You are looking for the name() function:
//*[#id="Catalog"]/*[name()="thead" or name()="tbody"]
Note that with XPath 2.0 your attempt //*[#id="Catalog"]/(thead|tbody) is correct. That approach does not work however with XPath 1.0.
Yes you can use:
//*[#id="Catalog"]/[nodename='thead' or nodename='tbody']
EDIT:
Just re-read your original post and realised what you were asking. The above syntax wouldn't be correct for this situation. Not sure how to get the name of the node to use but nodename isn't right...
I have the following sample XML structure:
<SavingAccounts>
<SavingAccount>
<ServiceOnline>yes</ServiceOnline>
<ServiceViaPhone>no</ServiceViaPhone>
</SavingAccount>
<SavingAccount>
<ServiceOnline>no</ServiceOnline>
<ServiceViaPhone>yes</ServiceViaPhone>
</SavingAccount>
</SavingAccounts>
What I need to do is filter the 'SavingAccount' nodes using XPATH where the value of 'ServiceOnline' is 'yes' or the value of 'ServiceViaPhone' is yes.
The XPATH should return me two rows!! I can filter 'SavingAccount' nodes where both of the element values are yes like the following XPATH sample, but what I want to do is an or element value comparison???
/SavingAccounts/SavingAccount/ServiceOnline[text()='yes']/../ServiceViaPhone[text()='yes']/..
This is a very fundamental XPath feature: composing a number of conditions with the logical operators and, or, and the function not().
and has a higher priority than or and both operators have lower priority than the relational and equality operators (=, !=, >, >=, < and <=).
So, it is safe to write: A = B and C = D
Some most frequent mistakes made:
People write AND and/or OR. Remember, XPath is case-sensitive.
People use the | (union) operator instead of or
Lastly, here is my solution:
/SavingAccounts/SavingAccount
[ServiceOnLine='yes' or ServiceViaPhone='yes']
/SavingAccounts/SavingAccount[(ServiceOnLine='yes') or (ServiceViaPhone='yes')]
Will
/SavingAccounts/SavingAccount[ServiceOnline/text()='yes' or ServiceViaPhone/text()='yes']
do the trick?
I have no XPath evaluator handy at the moment.
EDIT:
If I remember correctly, you don't need the text(), so
[ServiceOnline='yes' or ServiceViaPhone='yes']
should be sufficient, and more readable.
EDIT:
Yes, of course, 'or' for predicate expressions, my bad.