diff --git a/protocols/schemas/dataspace.prs b/protocols/schemas/dataspace.prs
new file mode 100644
index 0000000..55866c5
--- /dev/null
+++ b/protocols/schemas/dataspace.prs
@@ -0,0 +1,4 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+Observe = <Observe @pattern dataspacePatterns.Pattern @observer #!any>.
diff --git a/protocols/schemas/dataspacePatterns.prs b/protocols/schemas/dataspacePatterns.prs
new file mode 100644
index 0000000..bfba3ad
--- /dev/null
+++ b/protocols/schemas/dataspacePatterns.prs
@@ -0,0 +1,15 @@
+version 1 .
+
+; Dataspace patterns: a sublanguage of attenuation patterns.
+Pattern = DDiscard / DBind / DLit / DCompound .
+
+DDiscard = <_>.
+DBind = <bind @name symbol @pattern Pattern>.
+DLit = <lit @value any>.
+DCompound = @rec  <compound @ctor CRec  @members { int: Pattern ...:... }>
+          / @arr  <compound @ctor CArr  @members { int: Pattern ...:... }>
+          / @dict <compound @ctor CDict @members { any: Pattern ...:... }> .
+
+CRec = <rec @label any @arity int>.
+CArr = <arr @arity int>.
+CDict = <dict>.
diff --git a/protocols/schemas/gatekeeper.prs b/protocols/schemas/gatekeeper.prs
new file mode 100644
index 0000000..a25d6c3
--- /dev/null
+++ b/protocols/schemas/gatekeeper.prs
@@ -0,0 +1,5 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+Resolve = <resolve @sturdyref sturdy.SturdyRef @observer #!#!any>.
+Bind = <bind @oid any @key bytes @target #!any>.
diff --git a/protocols/schemas/protocol.prs b/protocols/schemas/protocol.prs
new file mode 100644
index 0000000..b86a66d
--- /dev/null
+++ b/protocols/schemas/protocol.prs
@@ -0,0 +1,14 @@
+version 1 .
+embeddedType sturdy.WireRef .
+
+Assertion = any .
+Handle    = int .
+Event     = Assert / Retract / Message / Sync .
+Oid       = int .
+Turn      = [TurnEvent ...].
+TurnEvent = [@oid Oid @event Event].
+
+Assert = <assert @assertion Assertion @handle Handle>.
+Retract = <retract @handle Handle>.
+Message = <message @body Assertion>.
+Sync = <sync @peer #!#t>.
diff --git a/protocols/schemas/racketEvent.prs b/protocols/schemas/racketEvent.prs
new file mode 100644
index 0000000..36985a7
--- /dev/null
+++ b/protocols/schemas/racketEvent.prs
@@ -0,0 +1,3 @@
+version 1 .
+
+RacketEvent = <racket-event @source #!any @event #!any>.
diff --git a/protocols/schemas/secureChatProtocol.prs b/protocols/schemas/secureChatProtocol.prs
new file mode 100644
index 0000000..09e9e7e
--- /dev/null
+++ b/protocols/schemas/secureChatProtocol.prs
@@ -0,0 +1,21 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+UserId = int .
+
+Join = <joinedUser @uid UserId @handle #!Session>.
+
+Session = @observeUsers <Observe =user @observer #!UserInfo>
+        / @observeSpeech <Observe =says @observer #!Says>
+        / NickClaim
+        / Says
+.
+
+NickClaim = <claimNick @uid UserId @name string @k #!NickClaimResponse>.
+NickClaimResponse = #t / NickConflict .
+
+UserInfo = <user @uid UserId @name string>.
+
+Says = <says @who UserId @what string>.
+
+NickConflict = <nickConflict>.
diff --git a/protocols/schemas/service.prs b/protocols/schemas/service.prs
new file mode 100644
index 0000000..11ac336
--- /dev/null
+++ b/protocols/schemas/service.prs
@@ -0,0 +1,5 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+RequireService = <require-service @serviceName any>.
+ServiceRunning = <service-running @serviceName any>.
diff --git a/protocols/schemas/simpleChatProtocol.prs b/protocols/schemas/simpleChatProtocol.prs
new file mode 100644
index 0000000..33804eb
--- /dev/null
+++ b/protocols/schemas/simpleChatProtocol.prs
@@ -0,0 +1,5 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+Present = <Present @username string>.
+Says = <Says @who string @what string>.
diff --git a/protocols/schemas/stream.prs b/protocols/schemas/stream.prs
new file mode 100644
index 0000000..a8c7ecc
--- /dev/null
+++ b/protocols/schemas/stream.prs
@@ -0,0 +1,38 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+; Assertion:
+StreamConnection = <stream-connection @source #!Source @sink #!Sink @spec any>.
+
+; Assertions:
+StreamListenerReady = <stream-listener-ready @spec any>.
+StreamListenerError = <stream-listener-error @spec any @message string>.
+
+; Assertion:
+StreamError = <error @message string>.
+
+Source =
+  ; Assertions:
+  / <sink @controller #!Sink>
+  / StreamError
+
+  ; Messages:
+  / <credit @amount CreditAmount @mode Mode>
+.
+
+Sink =
+  ; Assertions:
+  / <source @controller #!Source>
+  / StreamError
+
+  ; Messages:
+  / <data @payload any @mode Mode>
+  / <eof>
+.
+
+; Value:
+CreditAmount = @count int / @unbounded =unbounded .
+
+; Value:
+Mode = =bytes / @lines LineMode / <packet @size int> / <object @description any>.
+LineMode = =lf / =crlf .
diff --git a/protocols/schemas/sturdy.prs b/protocols/schemas/sturdy.prs
new file mode 100644
index 0000000..f82dd4e
--- /dev/null
+++ b/protocols/schemas/sturdy.prs
@@ -0,0 +1,44 @@
+version 1 .
+
+; Each Attenuation is a stage. The sequence of Attenuations is run RIGHT-TO-LEFT.
+; That is, the newest Attenuations are at the right.
+SturdyRef = <ref @oid any @caveatChain [Attenuation ...] @sig bytes>.
+
+; An individual Attenuation is run RIGHT-TO-LEFT.
+; That is, the newest Caveats are at the right.
+Attenuation = [Caveat ...].
+
+; embodies 1st-party caveats over assertion structure, but nothing else
+; can add 3rd-party caveats and richer predicates later
+Caveat = Rewrite / Alts .
+Rewrite = <rewrite @pattern Pattern @template Template>.
+Alts = <or @alternatives [Rewrite ...]>.
+
+Oid = int .
+WireRef = @mine [0 @oid Oid] / @yours [1 @oid Oid @attenuation Caveat ...].
+
+;---------------------------------------------------------------------------
+
+ConstructorSpec = CRec / CArr / CDict .
+CRec = <rec @label any @arity int>.
+CArr = <arr @arity int>.
+CDict = <dict>.
+
+Lit = <lit @value any>.
+
+Pattern = PDiscard / PAtom / PEmbedded / PBind / PAnd / PNot / Lit / PCompound .
+PDiscard = <_>.
+PAtom = =Boolean / =Float / =Double / =SignedInteger / =String / =ByteString / =Symbol .
+PEmbedded = =Embedded .
+PBind = <bind @name symbol @pattern Pattern>.
+PAnd = <and @patterns [Pattern ...]>.
+PNot = <not @pattern Pattern>.
+PCompound = <compound @ctor ConstructorSpec @members PCompoundMembers>.
+PCompoundMembers = { any: Pattern ...:... }.
+
+Template = TAttenuate / TRef / Lit / TCompound .
+TAttenuate = <attenuate @template Template @attenuation Attenuation>.
+TRef = <ref @name symbol>.
+TCompound = <compound @ctor ConstructorSpec @members TCompoundMembers>.
+TCompoundMembers = { any: Template ...:... }.
+
diff --git a/protocols/schemas/tcp.prs b/protocols/schemas/tcp.prs
new file mode 100644
index 0000000..7a6d5e1
--- /dev/null
+++ b/protocols/schemas/tcp.prs
@@ -0,0 +1,7 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+TcpRemote = <tcp-remote @host string @port int>.
+TcpLocal = <tcp-local @host string @port int>.
+
+TcpPeerInfo = <tcp-peer @handle #!any @local TcpLocal @remote TcpRemote>.
diff --git a/protocols/schemas/timer.prs b/protocols/schemas/timer.prs
new file mode 100644
index 0000000..30ea166
--- /dev/null
+++ b/protocols/schemas/timer.prs
@@ -0,0 +1,7 @@
+version 1 .
+
+SetTimer = <set-timer @label any @msecs double @kind TimerKind>.
+TimerExpired = <timer-expired @label any @msecs double>.
+TimerKind = =relative / =absolute / =clear .
+
+LaterThan = <later-than @msecs double>.
diff --git a/protocols/schemas/worker.prs b/protocols/schemas/worker.prs
new file mode 100644
index 0000000..25783b5
--- /dev/null
+++ b/protocols/schemas/worker.prs
@@ -0,0 +1,4 @@
+version 1 .
+embeddedType EntityRef.Ref .
+
+Instance = <Instance @name string @argument any>.