[#BloombergLP-balxml-PrefixStack-namespaceIdByIndex]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balxml.adoc[balxml]::xref:BloombergLP/balxml/PrefixStack.adoc[PrefixStack]::namespaceIdByIndex
:relfileprefix: ../../../
:mrdocs:

Return the namespace ID at the specified `index` in the prefix stack, where an `index` of 0 is the oldest ID on the stack. If `index` is negative, return the ID at position 'numPrefixes() ‐ index'. Thus, an `index` of ‐1 will return the most recent ID on the stack (i.e., the top of the stack). The behavior is undefined if `index > numPrefixes()` or `index < ‐numPrefixes()`.

== Synopsis

Declared in `<balxml_prefixstack.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
namespaceIdByIndex(int index) const;
----


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