11.5 Data Types


	operations	standard functions

numbers: IEEE 754 floating point (doubles)	+ , -, *, div, mod	floor(num), ceiling(num), round(num), sum(numbers), number(value)

strings: "...", '...'		concat(str-1, str-2, ...)
		substring(str, start, length)
		substring-after(str, substr)
		translate(str, chars, substitute-chars)
		normalize-space(str)
		string(value)
		string-length(str)
		starts-with(str, substr)?
		contains(str, substr)?
		format-number(num, format-string)

booleans	or, and	not(condition) true(), false(), boolean(value), lang(language)

node-sets		name(node-set)
		namespace-uri(node-set)
		local-name(node-set)
		last(), position(), count(node-set)
		id(id1 id2 ...)
	path-1 \| path-2
	path-1 / path-2

relations	=, !=, <, >, <=, >=

<article title="red"
         canvas="yellow">
  <section>
    <title>First
       section</title>
    <sentence>Some
       text.</sentence>
    <sentence>More
       text.</sentence>
  </section>
  <ns:appendix xmlns:ns="none"/>
</article>

(.='z') or (.='Z')

count( . | ../*[2] ) = 1

string-length() > 1

substring(.,1,1)='a'

contains( 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', . )

translate(string(),'.','') != ''

position()=1 and ( substring(string(.),string-length(string(.))) = ' ' )

The ‘div’ operation provides regular division; not integer division.
Indexes within strings start at 1
Type conversion
- Automatically to fit the operations, except for scalar values into node sets.
- The string values of boleans are ‘true’ and ‘false’.
- The integer value of false is zero, and of true is one.
- Strings translate to NaN (not a number), if they don’t correspond to numbers
- False values:
  integer 0, NaN
  node set empty
  strings zero length
- The boolean(), number(), and string() functions apply on the first node
Literals are not available for Booleans.
The id(id1 id2 ...) function returns the nodes having the specified IDs. The IDs should be defined as such, for instance in an included DTD; otherwise, the function is not available.
The functions local-name( ), namespace-uri( ), name( ) apply to the first node in the set.
Empty arguments refer to the context node (i.e., ‘.’)
In XML, the operations < and > must be escaped (e.g., < and >).

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integer	0, NaN
node set	empty
strings	zero length