Original text:
In the following cases, failure should be detected during pre- establishment: <del> A request by an application for Protocol Properties that include requirements or prohibitions that cannot be satisfied by any of the available protocols.  For example, if an application requires "Configure Reliability per Message", but no such feature is available in any protocol the host running the transport system on the host running the transport system this should result in an error, e.g., when SCTP is not supported by the operating system. </del>  A request by an application for Protocol Properties that are in conflict with each other, i.e., the required and prohibited 7.1. <del> For protocols that employ request/response pairs and do not require in-order delivery of the responses, like HTTP, the transport implementation may distribute interactions across several underlying transport connections.  For these kinds of protocols, implementations may hide the connection management and only expose a single Connection object and the individual requests/responses as messages. These Pooled Connections can use multiple connections or multiple streams of multi-streaming connections between endpoints, as long as all of these satisfy the requirements, and prohibitions specified in the Selection Properties of the Pooled Connection.  This enables implementations to realize transparent connection coalescing, connection migration, and to perform per-message endpoint and path selection by choosing among these underlying connections. </del>  7.2.

Reviewer comments:
So implementation talks about pooled connections - I must have blinked and missed that, obviously it is different to a connection group - or is it? If I am asking a silly question then I suspect we need just a few lines of text to demuddle me.
LGTM, thanks!

Revised text:
In the following cases, failure should be detected during pre- establishment:  <ins> A request by an application for Protocol Properties that cannot be satisfied by any of the available protocols.  For example, if an application requires "Configure Reliability per Message", but no such feature is available in any protocol the host running the transport system on the host running the transport system this should result in an error, e.g., when SCTP is not supported by the operating system. </ins> A request by an application for Protocol Properties that are in conflict with each other, i.e., the required and prohibited 7.1.  <ins> For applications that do not need in-order delivery of Messages, the Transport Services implementation may distribute Messages of a single Connection across several underlying transport connections or multiple streams of multi-streaming connections between endpoints, as long as all of these satisfy the Selection Properties.  The Transport Services implementation will then hide this connection management and only expose a single Connection object, which we here call a "Pooled Connection".  This is in contrast to Connection Groups, which explicitly expose combined treatment of Connections, giving the application control over multiplexing, for example. Pooled Connections can be useful when the application using the Transport Services system implements a protocol such as HTTP, which employs request/response pairs and does not require in-order delivery of responses.  This enables implementations of Transport Services systems to realize transparent connection coalescing, connection migration, and to perform per-message endpoint and path selection by choosing among multiple underlying connections. </ins> 7.2.