[#BloombergLP-balxml-NamespaceRegistry-lookupOrRegister]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balxml.adoc[balxml]::xref:BloombergLP/balxml/NamespaceRegistry.adoc[NamespaceRegistry]::lookupOrRegister
:relfileprefix: ../../../
:mrdocs:

Return the integer ID for the specified `namespaceUri`, registering it if necessary.

== Synopsis

Declared in `<balxml_namespaceregistry.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
lookupOrRegister(std::string_view const& namespaceUri);
----

== Description

Assign a new ID if the `namespaceUri` has not been registered before. Note that the IDs for pre‐registered namespaces (including the empty URI) are less than zero. (See "Preregistered Namespaces" in the `balxml_namespaceregistry` component‐level documentation.)

== Return Value

the integer ID for `namespaceUri`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *namespaceUri*
| namespace URI to look up or register
|===


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