DocumentType.validityFindings carries ValidityFinding values (reason
plus subject) instead of strings, DTDSchema.declarationErrors holds
ready ValidationErrors, and every declaration-level finding renders at
its declaration's coding path (x, r/@a) instead of at the document
root, matching the XSD consistency-errors precedent. Texts unchanged.
A relative system identifier declared inside an external entity
resolves against that entity's own URI (RFC 3986, the C14N resolver):
ExternalID gains base and resolvedSystemID, the scanner threads the
current entity's URI through external-subset and PE scans, and
resolvers receive the merged identifier. Clears eduni E18; the eduni
baseline now holds only the grapheme-lexing class (#135).
Closes#138
A declared 16/32-bit encoding over BOM-less 8-bit bytes is rejected; a
BOM followed by a declaration outside its family is rejected, reading
the declaration through the BOM's own byte pattern; and an external
entity whose text declaration names a higher XML version than the
document is refused (errata E38). The eduni not-wf baseline is empty.
Reader and decoder helpers split for the length caps.
Closes#137
The IBM section (1094 cases) runs clean to two documented classes:
279 pre-Fifth-Edition character-class cases (P85-89, count asserted
exactly) and 2 PE-in-internal-subset feature cases. Real gaps closed:
a document needs a root element (production 1); entity references in
literals must be Names or character references; WFC: No Recursion
checked at declaration over the general/parameter reference graph;
undeclared PE references split into WFC (standalone, or no external
declarations possible) versus deferred validity finding, also for
attribute-default references; refused external PEs are neither; and
groups split across PE replacements report VC: Proper Group/PE
Nesting. Entity machinery split to DoctypeScannerEntities for caps.
Closes#125
