diff --git a/Project.toml b/Project.toml
index 5d9d7ec..606b1b1 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "CitableBase"
 uuid = "d6f014bd-995c-41bd-9893-703339864534"
 authors = ["Neel Smith <dnsmith.neel@gmail.com>"]
-version = "9.0.1"
+version = "10.0.0"
 
 [deps]
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
diff --git a/docs/make.jl b/docs/make.jl
index 08b6ab1..8297e81 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -4,7 +4,7 @@
 #
 # Serve docs from repository root:
 #
-#   julia -e 'using LiveServer; serve(dir="docs/build")'julia -e 'using LiveServer; serve(dir="docs/build")' 
+#   julia -e 'using LiveServer; serve(dir="docs/build")'
 #
 using Pkg
 Pkg.activate(".")
diff --git a/docs/src/citable.md b/docs/src/citable.md
index f617ab1..e641305 100644
--- a/docs/src/citable.md
+++ b/docs/src/citable.md
@@ -288,7 +288,7 @@ The inverse of `cex` is `fromcex`.  We need two essential pieces of information
 ```@example book
 import CitableBase: fromcex
 function fromcex(traitvalue::BookCex, cexsrc::AbstractString, T;      
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     fields = split(cexsrc, delimiter)
     urn = Isbn10Urn(fields[1])
     CitableBook(urn, fields[2], fields[3])
diff --git a/docs/src/collections.md b/docs/src/collections.md
index 114522f..760ef65 100644
--- a/docs/src/collections.md
+++ b/docs/src/collections.md
@@ -110,7 +110,7 @@ end
 
 import CitableBase: fromcex
 function fromcex(traitvalue::BookCex, cexsrc::AbstractString, T;
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     fields = split(cexsrc, delimiter)
     urn = Isbn10Urn(fields[1])
     CitableBook(urn, fields[2], fields[3])
@@ -323,7 +323,7 @@ Recall from our experience implementing CEX serialization for `CitableBook`s tha
 
 ```@example collections
 function fromcex(trait::ReadingListCex, cexsrc::AbstractString, T; 
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     
     lines = split(cexsrc, "\n")
     datalines = filter(ln -> !isempty(ln), lines)
diff --git a/src/cex.jl b/src/cex.jl
index 9eeaed9..088ed60 100644
--- a/src/cex.jl
+++ b/src/cex.jl
@@ -55,9 +55,11 @@ end
 $(SIGNATURES)
 """    
 function fromcex(cexsrc::AbstractString, T; 
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", 
+    configuration = nothing,
+    strict = true)
     fromcex(cextrait(T), cexsrc, T, 
-    delimiter = delimiter, configuration = configuration)
+    delimiter = delimiter, configuration = configuration, strict = strict)
 end
 
 
@@ -66,10 +68,10 @@ end
 $(SIGNATURES)
 """ 
 function fromcex(fname::AbstractString, T, freader::Type{FileReader}; 
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     cexsrc =  open(f->read(f, String), fname)
     fromcex(cextrait(T), cexsrc, T, 
-    delimiter = delimiter, configuration = configuration)
+    delimiter = delimiter, configuration = configuration, strict = strict)
 end
 
 """Implement `fromcex` using first string parameter for a URL.
@@ -77,10 +79,10 @@ end
 $(SIGNATURES)
 """ 
 function fromcex(url::AbstractString, T, ureader::Type{UrlReader}; 
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     cexsrc = HTTP.get(url).body |> String
     fromcex(cextrait(T), cexsrc, T, 
-    delimiter = delimiter, configuration = configuration)
+    delimiter = delimiter, configuration = configuration, strict = strict)
 end
 
 """Implement `fromcex` using first string parameter for raw string data.
@@ -88,9 +90,9 @@ end
 $(SIGNATURES)
 """ 
 function fromcex(cexsrc::AbstractString, T, freader::Type{StringReader}; 
-    delimiter = "|", configuration = nothing)
+    delimiter = "|", configuration = nothing, strict = true)
     fromcex(cextrait(T), cexsrc, T, 
-    delimiter = delimiter, configuration = configuration)
+    delimiter = delimiter, configuration = configuration, strict = strict)
 end
 
 # Catch attempts to use fromex on NotCexSerializable or on  types with out an implementation
@@ -98,7 +100,7 @@ end
 
 $(SIGNATURES)
 """
-function fromcex(::NotCexSerializable, cex, T::Type{<: Any}; delimiter , configuration) 
+function fromcex(::NotCexSerializable, cex, T::Type{<: Any}; delimiter , configuration, strict) 
     throw(DomainError(T, "$(T) is not a CexSerializable type."))
 end
 
@@ -108,6 +110,6 @@ unimplemented trait value.
 $(SIGNATURES)
 """
 function fromcex(traitvalue::TraitType, cexsrc::AbstractString, T;
-    delimiter, configuration) where {TraitType <: CexTrait}
+    delimiter, configuration, strict) where {TraitType <: CexTrait}
     throw(DomainError(traitvalue, "`fromcex` is not implemented for trait $(traitvalue) on type $(T)."))  
 end
diff --git a/src/citable.jl b/src/citable.jl
index 64f4e29..b663ea0 100644
--- a/src/citable.jl
+++ b/src/citable.jl
@@ -75,5 +75,5 @@ end
 $(SIGNATURES)
 """
 function urntype(::NotCitable, x)
-    throw(DomainError(x, string( typeof(x), " does not implement the urn function.")))
+    throw(DomainError(x, string( typeof(x), " does not implement the urntype function.")))
 end