Module xsd_loader 

XTypes 1.3 Annex A — XSD schema loader for <types> XML (C4.5).

Spec OMG XTypes 1.3 §7.3.2 + §7.3.3 + Annex A: an XML type document (Annex-A schema) MUST be ingestible at runtime by a URI-capable loader. This is a precondition for create_type_w_uri and create_type_w_document (DynamicType API, comes with C4.1).

Scope C4.5 (this stage)

• URI loader: file://, data: (RFC 2397), inline bytes via load_type_libraries_from_string.
• Structural XSD-Annex-A validation: checks the element/ attribute names + required attributes per type construct. A full XSD 1.1 engine (XPath, Schematron) is not implemented.
• Spec namespace check: http://www.omg.org/spec/DDS-XML as the targetNamespace. Strict mode rejects a missing namespace.
• Reuse C7.D: returns Vec<TypeLibrary> (XML data model from xtypes_def); the TypeObject bridge is a future extension (C4.5-b after C4.1).

Deliberately not in the crate

• A full XSD-1.1 validator (XPath, key/keyref, assertions).
• HTTP/HTTPS URI schemes — only file:// + data:.
• XML catalog resolution.

Enums

ValidationMode

Strict vs lax validation mode.

Constants

DDS_XML_NAMESPACE

Spec namespace for DDS-XML (XTypes Annex A + DDS-XML 1.0 §7.1.5).

MAX_DATA_URI_BODY

Maximum data: body (DoS cap, 1 MiB).

MAX_FILE_BYTES

Maximum file:// file size (DoS cap, 16 MiB).

Functions

load_type_libraries_from_string

Loads XML type libraries directly from an inline string.

load_type_libraries_from_uri

Loads XML type libraries from a URI.