Compile RELAX NG from both syntaxes and across documents:
- A compact-syntax parser (lexer plus recursive descent) produces the same
pattern algebra the XML syntax compiles to. It covers element and attribute
declarations with name classes and namespace resolution, the , | & combinators
and ? * + cardinality, text/empty/notAllowed, list and mixed, datatypes and
value literals, grammars with start and named definitions (= |= &=), nested
grammars, and include/external references.
- The XML-syntax parser gains include (merging another grammar's definitions,
with the include's own nested definitions overriding) and externalRef
(resolving to an external schema's pattern), both through an injected loader.
Both syntaxes reach the loader through a new schemaLoader parameter that
returns nil by default, so compilation never touches the filesystem or network
unless a loader is supplied.
Closes#68
