Search a tag in a mrss_t, a mrss_item_t or a mrss_tag_t from name and a namespace.
it is the parent node (mrss_t or mrss_item_t)
the name of the element
the namespace. It can be null if the tag has a null namespace
the return pointer
the error code
See Implementation
Search a tag in a mrss_t, a mrss_item_t or a mrss_tag_t from name and a namespace.