Support inherit #50

parser.py Support EBNF from https://relaxng.org/compact-20021121.html section 2. Syntax: ``` decl ::= ..... |"default" "namespace" [identifierOrKeyword] "=" namespaceURILiteral ... namespaceURILiteral ::= ... | "inherit" ``` serializer.py If default namespace is inherit don't write a default ns on top level grammar For elements, don't write ns="" on name node if using the default namespace set to inherit - https://relaxng.org/compact-tutorial-20030326.html Section 10.2. Default namespace "A namespace declaration can refer to the null or absent namespace by using a namespace URI of """ - we don't want to refer to the null or absent namespace, we want to inherit - https://relaxng.org/tutorial-20011203.html Section 10.1. Using the ns attribute "A value of an empty string for the ns attribute indicates a null or absent namespace URI" - if we write ns="" for rng xml, it only matches null or absent namespace, not whatever is inherited from the default namespace of the referencing file For attributes, don't do anything different - https://relaxng.org/compact-tutorial-20030326.html Section 10.2. Default namespace "As with XML, the default namespace does not apply to attribute patterns" - https://relaxng.org/tutorial-20011203.html Section 10.1 Using the ns attribute "The attribute pattern also takes an ns attribute. However, there is a difference in how it defaults. This is because of the fact that the XML Namespaces Recommendation does not apply the default namespace to attributes. if an ns attribute is not specified on the attribute pattern, then it defaults to the empty string." - its still OK to set ns="" on attribute name elements. It is logically equivalent to remove them but that's antithetical to Simplification: https://relaxng.org/spec-20011203.htm Section 4.8. name attribute of element and attribute elements "If an attribute element has a name attribute but no ns attribute, then an ns="" attribute is added to the name child element."

default namespace prefix is already supported but I added a stand alone test case for it - it was being tested in relax.rnc but I thought a granular case would be useful to compare against as default namespace prefix = inherit case parser.py See reference for production non-terminal namespaceURILiteral in https://relaxng.org/compact-20021121.html for sections "2. Syntax" or "A. Formal Description 1. Syntax" excerpt of EBNF from section 2. Syntax decl ::= "default" "namespace" [identifierOrKeyword] "=" namespaceURILiteral ... namespaceURILiteral ::= literal | "inherit" See reference for "RELAX NG Compact Syntax Tutorial" https://relaxng.org/compact-tutorial-20030326.html Section "16.1 inherit keyword" serializer.py If default namespace prefix is inherit don't write a default ns or prefix on top level grammar - since Prefixed namespace bindings may not be empty see https://www.w3.org/TR/REC-xml-names/#ns-using Section 5 Using Qualified Names "In a namespace declaration for a prefix (i.e., where the NSAttName is a PrefixedAttName), the attribute value MUST NOT be empty." If there is a prefixed namespace while serializing NAME, don't write ns="" - since that means not to inherit. This doesn't impact serializing NAME when the context is within an attribute. Writing ns="" would be fine since there is a difference how it defaults. It may be more consistent to leave the ns="" on the attribute but that would add a little more code. I also kind of like the behavior - If you have a ns prefix inherit no ns="" exists

See reference for production non-terminal namespaceURILiteral in https://relaxng.org/compact-20021121.html for sections "2. Syntax" or "A. Formal Description 1. Syntax" excerpt of EBNF from section 2. Syntax decl ::= "namespace" identifierOrKeyword "=" namespaceURILiteral ... namespaceURILiteral ::= literal | "inherit" parser.py - Add production for declaring a namespace as inherit similar to declaring default namespace prefix as inherit No additional changes for serializer.py - if the prefix namespace is inherit don't write the ns on the ELEMENT node. - As a stand alone file, we can't follow steps in https://relaxng.org/spec-20011203.html 4. Simplification Specifically 4.10. QNames, "The context must have a mapping for the prefix" so we can't do this step, because we don't have a mapping. Test case added: See reference for "RELAX NG Compact Syntax Tutorial" https://relaxng.org/compact-tutorial-20030326.html Section "16.1 inherit keyword" for more examples. Added ns-inherit.rnc and ns-inherit.rng - no namespaces have been added for the element and attribute - similar to if "default namespace = inherit (not using a prefix) - other than attribute's ns="", since it doesn't inherit the default - different from no default specified, and no declared ns prefix used - element and attribute would have ns="", since rnc2html looks to be assuming its a top level grammar meaning, per https://relaxng.org/compact-tutorial-20030326.html 10.2. Default namespace, non-explicitly would match the explicit declaration - default namespace = ""

https://relaxng.org/compact-20021121.html Section 2 Syntax ``` decl := "namespace" identifierOrKeyword "=" namespaceURILiteral | "default" "namespace" [identifierOrKeyword] "=" namespaceURILiteral ... namespaceURILiteral := literal | "inherit" ``` Add ns_uri_inh production that handles - strlit - INHERIT Update decl's to share the new production - decl_default_ns - decl_default_names_ns - decl_ns

https://relaxng.org/compact-tutorial-20030326.html Section 10.2 Default namespace A namespace declaration can refer to the null or absent namespace by using a namespace URI of "" A file can ensure that its default namespace will be the null or absent namespace and will not be inherited from any referencing file by explicitly declaring the default namespace as "" Added Case default-ns-empty.rnc - looks a lot like simple.rnc with the addition of an attribute Notice how default-ns-empty.rnc and simple.rnc have similar ns="" in their rng conversion without simple.rnc defining a default namespace. In https://relaxng.org/compact-tutorial-20030326.html section 10.2 Default namespace If a file does not declare a default namespace and is a top-level file that is not referenced from another file using include or external, then the default namespace is the absent or null namespace.

See https://relaxng.org/compact-20021121.html 4. Declarations The URI may be empty. This makes the prefix stand for the absent namespace URI. This is necessary for specifying a name class that matches any name with an absent namespace URI. Updated serializer.py to not write empty prefixed namespace bindings. - see https://www.w3.org/TR/REC-xml-names/#ns-using Section 5 Using Qualified Names "In a namespace declaration for a prefix (i.e., where the NSAttName is a PrefixedAttName), the attribute value MUST NOT be empty." Test Cases: - Added defaul-ns-prefix-empty.rnc - Added ns-empty.rnc - as a simple coverage case. relax.rnc also touches this feature - Updated relax.rnc - It was adding xmlns:local="" but that violates qualified names requirements. - trang-20220510 reports this error when converting relax.rng to rnc: fatal: The value of the attribute "prefix="xmlns",localpart="local",rawname="xmlns:local"" is invalid. Prefixed namespace bindings may not be empty.

A slightly more complex example showing how inherit and empty (null or absent) namespace work together

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Support inherit #50

Support inherit #50

Commits on Aug 6, 2024