===== Topic Name =====
[[ddsf:public:guidebook:06_append:glossary:start| Return to Glossary ]]

**Topic Name**, 
while it is true that the [[ddsf:public:guidebook:06_append:glossary:d:data_distribution_service_dds]] [[ddsf:public:guidebook:06_append:glossary:a:api| API]] specification does not mention a limit for [[ddsf:public:guidebook:06_append:glossary:t:topic|Topic]] names, the complementary DDS [[ddsf:public:guidebook:06_append:glossary:w:wireprotocol|Wire Protocol]] specification: [[ddsf:public:guidebook:06_append:glossary:r:rtps]] protocol (http://www.omg.org/spec/DDSI-RTPS/2.2) does state that Topic names shall not exceed 256 characters (see Table 9.12).

So the 256 character limit on Topic name lengths imposed by the [[ddsf:public:guidebook:06_append:05_vendors:rti]] DDS implementation is not arbitrary. It is precisely what is required to be interoperable with other DDS implementations.

Source: [[https://stackoverflow.com/questions/27970321/limit-on-dds-topic-names#:~:text=The%20complementary%20DDS%20Wire%20Protocol,DDS%20implementation%20is%20not%20arbitrary. | Topic Name ]]