IsSelectionPrefix (XmlDoc function): Difference between revisions
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{{Template:XmlDoc:IsSelectionPrefix subtitle}} | {{Template:XmlDoc:IsSelectionPrefix subtitle}} | ||
<var>IsSelectionPrefix</var> determines whether its argument is a prefix that can be used in an | <var>IsSelectionPrefix</var> determines whether its argument is a prefix that can be used in an [[XPath#XPath_syntax|XPath expression]]. <var>IsSelectionPrefix</var> returns the value <code>True</code> if its argument is currently associated (either with the null string or with a namespace URI) as a prefix that you can use in an XPath expression. Otherwise, it returns <code>False</code>. | ||
==Syntax== | ==Syntax== | ||
| Line 6: | Line 6: | ||
===Syntax terms=== | ===Syntax terms=== | ||
<table class="syntaxTable"> | <table class="syntaxTable"> | ||
<tr><th>%boolean</th> | <tr><th nowrap>%boolean</th> | ||
<td>A declared enumeration object of type <var>[[Enumerations#Using Boolean enumerations|Boolean]]</var> to contain the returned value (< | <td>A declared [[Enumerations|enumeration]] object of type <var>[[Enumerations#Using Boolean enumerations|Boolean]]</var> to contain the returned value (<var>True</var> or <var>False</var>) of <var>IsSelectionPrefix</var>.</td></tr> | ||
<tr><th>doc</th> | <tr><th>doc</th> | ||
<td>An <var>XmlDoc</var> object expression. </td></tr> | <td>An <var>XmlDoc</var> object expression. </td></tr> | ||
| Line 16: | Line 16: | ||
==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li><var>IsSelectionPrefix</var> has no cancellation conditions other than the usual requirement that the method obj8ect not be Null. | <li><var>IsSelectionPrefix</var> has no cancellation conditions other than the usual requirement that the method obj8ect not be <var>Null</var>. | ||
<li><var>IsSelectionPrefix</var> is available in <var class="product"> | <li><var>IsSelectionPrefix</var> is available in <var class="product">Sirius Mods</var> Version 7.0 and later. | ||
</ul> | </ul> | ||
==Examples== | ==Examples== | ||
In the following example fragment, the code is testing for a new prefix to use in an XPath expression, to avoid having to change any existing prefix associations: | |||
<p class="code">... | <p class="code">... | ||
for %i from 1 to 100 | for %i from 1 to 100 | ||
| Line 35: | Line 35: | ||
%doc:[[DeleteSelectionPrefix_(XmlDoc_subroutine)|deleteSelectionPrefix]]('p' with %i) | %doc:[[DeleteSelectionPrefix_(XmlDoc_subroutine)|deleteSelectionPrefix]]('p' with %i) | ||
... | ... | ||
</p | </p> | ||
==See also== | ==See also== | ||
<ul> | <ul> | ||
<li>[[DeleteSelectionPrefix (XmlDoc subroutine)|DeleteSelectionPrefix]] | <li><var>[[DeleteSelectionPrefix (XmlDoc subroutine)|DeleteSelectionPrefix]]</var> is useful in conjunction with <var>IsSelectionPrefix</var> to delete the selected subtree. | ||
<li>[[SelectionNamespace (XmlDoc property)|SelectionNamespace]] specifies the namespace | <li><var>[[SelectionNamespace (XmlDoc property)|SelectionNamespace]]</var> specifies the namespace URI associated with a prefix, when the prefix is used in an XPath expression. | ||
</ul> | </ul> | ||
{{Template:XmlDoc:IsSelectionPrefix footer}} | {{Template:XmlDoc:IsSelectionPrefix footer}} | ||
Latest revision as of 21:22, 2 September 2015
Check if prefix has XPath-selection association (XmlDoc class)
IsSelectionPrefix determines whether its argument is a prefix that can be used in an XPath expression. IsSelectionPrefix returns the value True if its argument is currently associated (either with the null string or with a namespace URI) as a prefix that you can use in an XPath expression. Otherwise, it returns False.
Syntax
%boolean = doc:IsSelectionPrefix( prefix)
Syntax terms
| %boolean | A declared enumeration object of type Boolean to contain the returned value (True or False) of IsSelectionPrefix. |
|---|---|
| doc | An XmlDoc object expression. |
| prefix | A string prefix (the part of the name before the colon) for a node. This is a Unicode string argument; prior to Sirius Mods Version 7.6, this is an EBCDIC string. Its length must be at most 255 characters. |
Usage notes
- IsSelectionPrefix has no cancellation conditions other than the usual requirement that the method obj8ect not be Null.
- IsSelectionPrefix is available in Sirius Mods Version 7.0 and later.
Examples
In the following example fragment, the code is testing for a new prefix to use in an XPath expression, to avoid having to change any existing prefix associations:
... for %i from 1 to 100 if %doc:isSelectionPrefix('p' With %i) eq false then loop end end if end for %doc:selectionNamespace('p' with %i) = 'urn:localxxx' %node = %inpNode:selectSingleNode(%p With %i - with ':infoChild') %doc:deleteSelectionPrefix('p' with %i) ...
See also
- DeleteSelectionPrefix is useful in conjunction with IsSelectionPrefix to delete the selected subtree.
- SelectionNamespace specifies the namespace URI associated with a prefix, when the prefix is used in an XPath expression.