Read XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition Online
Authors: Michael Kay
XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (578 page)
xmlns:soap=“http://schemas.xmlsoap.org/soap/envelope/”
xmlns:xs=“http://www.w3.org/2001/XMLSchema”>
xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”
xmlns:soap=“”>
| Expression | Result |
| in-scope-prefixes(/soap:Envelope) | (“xs”, “soap”, “xml”) (in any order) |
| in-scope-prefixes(//*:inputString) | (“xs”, “”, “xsi”, “xml”) (in any order) |
Usage
Like the namespace axis that it replaces, this function is unlikely to be needed every day of the week. It is generally needed only when dealing with documents that use namespace prefixes as part of the content of elements and attributes (and not only in forming the names of elements and attributes). I have also seen situations where it is necessary simply to detect whether a particular namespace is declared, regardless whether or not it is actually used. For example, you might want to find all your stylesheets that declare the namespace
http://icl.com/saxon
because you have decided to migrate from Saxon 6.5 (which uses this namespace) to Saxon 9.x (which does not). You could find these using the query:
collection(“stylesheets”)[//*[“http://icl.com/saxon” =
for $p in in-scope-prefixes(.)
return namespace-uri-for-prefix($p, .)]]
See Also
namespace-uri-for-prefix()
on page 839
resolve-QName()
on page 864
insert-before
The
insert-before()
function returns a sequence constructed by inserting an item, or a sequence of items, at a given position within another sequence.
For example,
insert-before((“a”,“b”,“c”), 2, “X”)
returns(“a”, “X”, “b”, “c”).
Signature
| Argument | Type | Meaning |
| sequence-1 | item()* | The original sequence |
| position | xs:integer | The position in the original sequence where the new items are to be inserted |
| sequence-2 | item()* | The items that are to be inserted |
| Result | item()* | The constructed sequence |
Effect
Remember that sequences are immutable: despite its name, this function doesn't modify the supplied sequence; it constructs a new sequence containing items copied from the two input sequences.
The returned sequence consists of all items in
sequence-1
whose position is less than the specified
position
, followed by all items in
sequence-2
, followed by all remaining items in
sequence-1
. Positions, as always, are numbered starting at one. It's not an error if
position
is outside the actual range of positions in the sequence.
In other words, the result is the same as the value of the expression:
$sequence-1[position() lt $position],
$sequence-2,
$sequence-1[position() ge $position]
Examples
| Expression | Result |
| insert-before(1 to 5, 4, (99, 100)) | (1, 2, 3, 99, 100, 4, 5) |
| insert-before(1 to 5, 0, 99) | (99, 1, 2, 3, 4, 5) |
| insert-before(1 to 5, 10, 99) | (1, 2, 3, 4, 5, 99) |
Usage
Although functions are provided to insert items into and remove items from a sequence, there is no function to replace the item at a given position
$p
. To achieve this, you can write:
insert-before(remove($seq, $p), $p, $new-item)
or perhaps more simply:
$seq[position() lt $position],
$new-item,
$seq[position() gt $position]
See Also
remove()
on page 861
,operator on page 634 in Chapter 10
iri-to-uri
iri-to-uri()
converts an IRI (Internationalized Resource Identifier) into a URI by percent-encoding special characters according to the rules of RFC 3986 and RFC 3987.
For example,iri-to-uri(‘http://www.wikipedia.org/Gerhard Schröder’)returnshttp://www.wikipedia.org/Gerhard%20Schr%C3%B6der.
