Value (XmlDoc/XmlNode property)
String-value of selected node (XmlDoc and XmlNode classes)
This settable property obtains a substring of the XPath "string-value" of a node, including its Text descendants. The string-value depends on the node type, as shown in Usage Notes, below.
Syntax
%currentUnicode = nr:Value[( [xpath])] nr:Value[( [xpath])] = newUnicode Throws XPathError
Syntax terms
| %currentUnicode | A Unicode string that is the string-value of the context node. Prior to Sirius Mods Version 7.6, this is an EBCDIC string. |
|---|---|
| nr | An XmlDoc or XmlNode, used as the context node for the xpath expression. If an XmlDoc, the Root node is the context node. |
| xpath | An Xpath expression that results in a nodelist, the head of which is the node to process. Any other nodes in the nodelist are ignored.
This is an optional argument, and its default is a period ( |
| newUnicode | A Unicode string that is the string-value to assign to the context XmlNode's Value property. Prior to Sirius Mods Version 7.6, this is an EBCDIC string. |
Usage notes
- As of Sirius Mods Version 7.3, the string terms in the method syntax may include only non-null EBCDIC characters that translate to Unicode. As of Sirius Mods Version 7.6, these strings are Unicode or are converted to Unicode.
For more information about the effects of this Version 7.6 change, see Strings and Unicode with the XmlDoc API. For an example of a specific effect that involves the Value method, see this example, below.
- The string-value of a node depends on the node's type:
Node type String-value Attribute The "normalized attribute value" Comment or Text The content of the node Element or Root The concatenation of the value of all its Text descendants, in document order PI The portion of the processing instruction following its target and any whitespace immediately following the target - Value is not allowed to be set if the head of the argument XPath result is the Root or is an Element with a non-Text child.
Examples
- The following example displays the string "Hello, world!":
begin %d object xmlDoc %d = new %d:loadXml('<t><a>Hell</a>' with '<b>o, world!'</b></t>') print %d:value('/t') end
- The following example assigns a new value to the "billRate" element:
%worker:value('billRate') = %worker:value('billRate') - 10
- In the following request, run under Sirius Mods Version 7.6 or greater, an ampersand (
&) in an Element value is returned by the Value method and displayed by two Print statements.begin %d object xmlDoc auto new %nodex is xmlNode %nodey is xmlNode %ebc is longstring %nodey = %d:addElement('top') %nodex = %nodeY:addElement('abc', 'Jack & Jill') %ebc = %nodex:value print %ebc print %nodex:value end
The result is:
Jack & Jill Jack & Jill
Because the Unicode string returned from Value in the example above is assigned to an EBCDIC variable before it is printed for the first time, the initial Print statement simply displays the EBCDIC variable value as is. The assignment to EBCDIC causes a straight character-by-character conversion using the current Unicode translation tables.
The second Print statement has to convert the Unicode value returned by the Value expression. For this, under Sirius Mods Version 7.6 or greater, Print uses character encoding for any Unicode characters that do not translate to EBCDIC, and an ampersand is converted to the string
&. In effect, Print calls the UnicodeToEbcdic method with parameter settingCharacterEncode=Trueto implicitly convert the Unicode value.
Request-cancellation errors
This list is not exhaustive: it does not include all the errors that are request cancelling.
- xpath expression is invalid.
- Result of xpath is empty.
- Insufficient free space exists in CCATEMP.
See also
- ValueDefault is a function that obtains an XmlNode's string value and that allows an empty XPath result.
- For more information about using XPath expressions, see XPath.