fn:doc-available
Whether a document is available
Description
The fn:doc-available function is a way to avoid the errors returned by the fn:doc function if a document is not available. This function will return true if calling the fn:doc function on the same URI will result in a document node. It will return false if the fn:doc function would not return a document node.
This description is © Copyright 2007, Priscilla Walmsley. It is excerpted from the book XQuery by Priscilla Walmsley, O'Reilly, 2007. For a complete explanation of this function, please refer to Appendix A of the book.
Arguments and Return Type
| Name | Type | Description |
|---|---|---|
$uri |
xs:string? |
the URI of the document to check for |
| return value | xs:boolean |
Examples
| XQuery Example | Results |
|---|---|
doc-available(
'http://www.functx.com/input/order.xml') |
true |
doc-available(
'http://www.functx.com/input/foo.xml') |
false |
See Also
| fn:doc | Opens a document based on a URI |
History
| Published On | Last Updated | Contributor(s) |
|---|---|---|
| 2006-06-27 | 2007-02-26 | W3C, XQuery 1.0 and XPath 2.0 Functions and Operators, http://www.w3.org/TR/xpath-functions/ |
Recommended Reading:
