string-length | real length of a string | Regex library

I want to transform a XML file using XSLT. During the transformation, there are new attributes added to the output file which I can't get my head around.

Input XML file (abbr.):

I'm looking for some help with an XSL error. It's called XTSE1015 which stands for "An xsl:sort element with a select attribute must be empty". It happens when i try to output file to xml or text. Software such as Oxygen XML Editor or event Notepad++ show this error. I can't find any solution to this, well except not using sort but that is not a proper solution. Somebody stumbled upon this problem maybe and has some advice or something?

I have an XML like this

I am trying to use apply-templates for elements encapsulated within parent element but has different element name. In my example I want to apply it to /Author/Name/ elements and choose either of one whichever has a value. This task is continuation of another question I have asked. I am using the following XML

I am working in project where I am given a list of allowed characters, and required to remove the unwanted characters. I have the following done, but I felt it is cumbersome and than it should be

I am trying to find the largest element using length and value

my input xml:

Working in XSD 1.1 I have a schema that includes text elements in which I am supposed to mark certain words with the tag "keyword". Something like this:

ex 1: I have a specific taste.

These keywords can either stand as seen or also be part of a category which is defined as an optional attribute within the keyword element. The keyword either is supposed to refer to such a category, or to have the searched keyword inside as string or to display a combination of both. So they should be freely intermixable like this:

ex 2: The sword that I used is made of steel.

So far so good. But now I am supposed to build a condition-structure that also uses these keywords but without showing them inside the text itself. So it is asked for only refering to them like in the second example when only the category is referenced but no string is inside the keyword-element. This is mandatory because all strings inside elements are later supposed to be read by another program. The aim is something like this:

ex 3: By now swinging it, the sheer fore is cutting through my enemies.

In comparison, something like this is supposed to be forbidden as the strings inside the conditioned-keyword-element would be displayed in the string that is supposed to be readable later:

ex 4: swordBy now swinging it, the sheer fore is cutting through my enemies.

My task now is to forbid such a structure. How do I realise this? In my schema I assume I need to build an assert as part of the condition-element but I am lost on how to do it. I already tried several approaches like this:

ex 5:

I want to transform a xml file like this:

(input.xml)

Good afternoon, I am new to the WSO2 ESB and I am working with an api in which we are using a mediator script with javascript, however I get that the script does not work correctly, basically the script which takes the value and makes it some transformation, however, at the log level I see that the variable only indicates a value of True, as if it were boolean

My API is the following: