Class: Lutaml::Xml::Schema::XsdSchema

Inherits:
Object
  • Object
show all
Extended by:
Model::Schema::SharedMethods
Includes:
Model::Schema::SharedMethods
Defined in:
lib/lutaml/xml/schema/xsd_schema.rb

Overview

XSD Schema generation for XML models

Generates W3C XML Schema (XSD) from LutaML model classes. Supports namespace declarations, type definitions, and nested models.

Defined Under Namespace

Classes: Context

Constant Summary collapse

UNSUPPORTED_XSD_REGEX_FLAGS = 
Regexp::IGNORECASE | Regexp::MULTILINE | Regexp::EXTENDED

Class Method Summary collapse

Methods included from Model::Schema::SharedMethods

extract_register_from

Class Method Details

.attr_is_xml_attribute?(xml_mapping, attr_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 798

def self.attr_is_xml_attribute?(xml_mapping, attr_name)
  xml_mapping.attributes.any? { |rule| rule.to == attr_name }
end

.build_element_attributes(name, xsd_type, attr, xml_mapping, attr_name) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 802

def self.build_element_attributes(name, xsd_type, attr, xml_mapping,
attr_name)
  attrs = { name: name.to_s, type: xsd_type }

  # Handle collection cardinality
  if attr.collection?
    range = attr.resolved_collection
    if range
      attrs[:minOccurs] = range.min.to_s
      attrs[:maxOccurs] =
        range.end.infinite? ? "unbounded" : range.max.to_s
    else
      attrs[:minOccurs] = "0"
      attrs[:maxOccurs] = "unbounded"
    end
  end

  # Add form attribute from mapping rule if present
  if xml_mapping
    rule = xml_mapping.find_element(attr_name)
    attrs[:form] = rule.form.to_s if rule&.form
    attrs[:annotation] = rule.documentation if rule&.documentation
  end

  attrs
end

.classify_xsd_type(type_name, klass, register) ⇒ Symbol

Classify an XSD type name into one of three categories

Parameters:

  • type_name (String) —

    The XSD type name to classify

  • klass (Class) —

    The model class being processed

  • register (Register) —

    The register for type resolution

Returns:

  • (Symbol) —

    :builtin, :custom, :unresolvable, or :unknown



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 114

def self.classify_xsd_type(type_name, klass, register)
  return :builtin if BuiltinTypes.builtin?(type_name)

  # Custom type - check if resolvable
  if type_name && !type_name.start_with?("xs:")
    return :custom if type_resolvable?(type_name, klass, register)

    return :unresolvable
  end

  :unknown
end

.collection_placeholder?(attr, mapping) ⇒ Boolean

Whether a nested model is emitted only as a placeholder: a collection of a type_name-less model renders as <element name="item" type="xs:string"/>, so the model's own content is never inlined or referenced. This document therefore neither declares its namespaces nor defines its nested types — the walkers must not descend into it.

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 490

def self.collection_placeholder?(attr, mapping)
  attr.collection? && mapping&.type_name_value.nil?
end

.declare_referenced_namespaces!(schema_attrs, referenced, target_uri, skip_validation) ⇒ Object

Declare xmlns: for every namespace this schema references. Foreign model namespaces are strict: an unusable prefix or a prefix collision always raises (the emitted QNames would resolve to the wrong namespace), while a missing schema_location raises unless skip_validation downgrades it to a warning (the output stays structurally correct, only the import is unresolvable). Type::Value namespaces are declared best-effort (their xsd_type references are emitted verbatim).



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 310

def self.declare_referenced_namespaces!(schema_attrs, referenced, target_uri, skip_validation)
  referenced[:foreign_models].each do |ns_class|
    # An unusable or colliding prefix makes emitted QNames resolve to
    # the wrong namespace — never recoverable, even under
    # skip_validation.
    error = foreign_prefix_error(ns_class, schema_attrs, target_uri)
    raise Lutaml::Model::Error, error if error

    # A missing schema_location leaves the import unresolvable but the
    # output structurally correct — recoverable under skip_validation.
    unless ns_class.schema_location
      error = missing_schema_location_error(ns_class)
      raise Lutaml::Model::Error, error unless skip_validation

      warn "[Lutaml::Model] WARN: #{error} " \
           "(skip_validation: emitting best-effort output)"
    end

    schema_attrs[:"xmlns:#{ns_class.prefix_default}"] = ns_class.uri
  end

  referenced[:type_values].each do |ns_class|
    prefix = ns_class.prefix_default
    next unless usable_prefix?(prefix)

    # A prefix bound to two different namespaces emits QNames that
    # resolve to the wrong one — the same unrecoverable collision the
    # foreign path raises on, so raise here too rather than silently
    # keeping the first binding.
    error = prefix_collision_error(prefix, ns_class.uri, schema_attrs)
    raise Lutaml::Model::Error, error if error

    schema_attrs[:"xmlns:#{prefix}"] = ns_class.uri
  end
end

.effective_facets(attr, attr_type) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 639

def self.effective_facets(attr, attr_type)
  return {} unless attr_type.is_a?(Class) &&
    attr_type < Lutaml::Model::Type::Value

  attr.effective_restriction_facets(attr_type)
end

.emit_bound(xml, element, value, type) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 691

def self.emit_bound(xml, element, value, type)
  emit_facet(xml, element, lexical_value(type, value)) unless value.nil?
end

.emit_facet(xml, element, value) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 695

def self.emit_facet(xml, element, value)
  return if value.nil?

  xml.public_send(qn(element), value: value.to_s)
end

.emit_import(xml, ns_class) ⇒ Object

Emit a single xs:import for a namespace class, with schemaLocation when the class declares one.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 406

def self.emit_import(xml, ns_class)
  import_attrs = { namespace: ns_class.uri }
  if ns_class.schema_location
    import_attrs[:schemaLocation] = ns_class.schema_location
  end
  xs(xml, "import", import_attrs)
end

.emit_restriction(xml, base, facets, type) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 657

def self.emit_restriction(xml, base, facets, type)
  xs(xml, "simpleType") do
    xs(xml, "restriction", base: base) do
      emit_restriction_facets(xml, facets, type)
    end
  end
end

.emit_restriction_facets(xml, facets, type) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 665

def self.emit_restriction_facets(xml, facets, type)
  emit_bound(xml, :minExclusive, facets[:min_exclusive], type)
  emit_bound(xml, :minInclusive, facets[:min_inclusive], type)
  emit_bound(xml, :maxExclusive, facets[:max_exclusive], type)
  emit_bound(xml, :maxInclusive, facets[:max_inclusive], type)
  emit_facet(xml, :totalDigits, facets[:total_digits])
  emit_facet(xml, :fractionDigits, facets[:fraction_digits])
  emit_facet(xml, :length, facets[:length])
  emit_facet(xml, :minLength, facets[:min_length])
  emit_facet(xml, :maxLength, facets[:max_length])
  Array(facets[:enumeration]).each do |value|
    emit_facet(xml, :enumeration, lexical_value(type, value))
  end
  emit_facet(xml, :whiteSpace, facets[:white_space])
  patterns = Array(facets[:pattern])
  if patterns.size > 1
    raise Lutaml::Model::Error,
          "Cannot export #{patterns.size} conjunctive patterns on " \
          "#{type} to a single xs:restriction: sibling xs:pattern " \
          "facets are alternatives (OR), and XSD cannot express " \
          "conjunction (AND) without nested restriction derivation, " \
          "which is not yet supported."
  end
  patterns.each { |re| emit_facet(xml, :pattern, pattern_value(re)) }
end

.emit_value_element(xml, attrs, xsd_type, attr_type, attr) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 646

def self.emit_value_element(xml, attrs, xsd_type, attr_type, attr)
  facets = effective_facets(attr, attr_type)
  if facets.any?
    xs(xml, "element", attrs.except(:type)) do
      emit_restriction(xml, xsd_type, facets, attr_type)
    end
  else
    xs(xml, "element", attrs.merge(type: xsd_type))
  end
end

.emit_xsd_attribute(xml, attr, rule, xsd_type, attr_type) ⇒ Object

Emit an xs:attribute, inlining an xs:restriction when the attribute is a constrained value type (its type= moves into the restriction base) and/or an annotation when the mapping carries documentation.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 618

def self.emit_xsd_attribute(xml, attr, rule, xsd_type, attr_type)
  facets = effective_facets(attr, attr_type)
  restricted = facets.any?

  attr_attrs = { name: rule.name }
  attr_attrs[:type] = xsd_type unless restricted
  attr_attrs[:use] = "required" if attr.options[:required]
  attr_attrs[:form] = rule.form.to_s if rule.form

  return xs(xml, "attribute", attr_attrs) unless restricted || rule.documentation

  xs(xml, "attribute", attr_attrs) do
    if rule.documentation
      xs(xml, "annotation") do
        xs(xml, "documentation", rule.documentation)
      end
    end
    emit_restriction(xml, xsd_type, facets, attr_type) if restricted
  end
end

.foreign_namespace?(mapping, target_uri) ⇒ Boolean

Whether a nested model's mapping belongs to a namespace other than the schema's target namespace. A model with no namespace belongs to the target schema (not foreign).

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 466

def self.foreign_namespace?(mapping, target_uri)
  ns_class = mapping&.namespace_class
  return false unless ns_class

  ns_class.uri != target_uri
end

.foreign_prefix_error(ns_class, schema_attrs, target_uri) ⇒ Object

Why a foreign namespace's prefix cannot be used in this schema's QNames, or nil when it can.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 348

def self.foreign_prefix_error(ns_class, schema_attrs, target_uri)
  prefix = ns_class.prefix_default
  unless usable_prefix?(prefix)
    schema_desc = target_uri ? "the '#{target_uri}'" : "this no-namespace"
    return "XSD generation: foreign namespace '#{ns_class.uri}' " \
           "needs a usable prefix_default (not nil/empty/'xs') to " \
           "be referenced from #{schema_desc} schema."
  end

  prefix_collision_error(prefix, ns_class.uri, schema_attrs)
end

.generate(klass, options = {}) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 88

def self.generate(klass, options = {})
  register = extract_register_from(klass)
  xml_mapping = klass.mappings_for(:xml)

  # Validate XSD types unless explicitly skipped
  validate_xsd_types!(klass, register) unless options[:skip_validation]

  # Use Builder with adapter from options or config
  adapter_type = options[:adapter] || Lutaml::Model::Config.xml_adapter_type || :nokogiri

  schema_builder = Builder.new(
    adapter_type: adapter_type,
    options: { encoding: "UTF-8" },
  ) do |xml|
    generate_schema(xml, klass, xml_mapping, register, options)
  end

  schema_builder.to_xml(options)
end

.generate_annotation(xml, xml_mapping) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 422

def self.generate_annotation(xml, xml_mapping)
  xs(xml, "annotation") do
    doc_text = xml_mapping.documentation_text
    doc_text ||= xml_mapping.namespace_class&.documentation if xml_mapping.namespace_class

    xs(xml, "documentation", doc_text) if doc_text
  end
end

.generate_attributes(xml, klass, register, xml_mapping) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 602

def self.generate_attributes(xml, klass, register, xml_mapping)
  return unless xml_mapping

  xml_mapping.attributes.each do |rule|
    attr = klass.attributes[rule.to]
    next unless attr

    attr_type = attr.type(register)
    xsd_type = get_attribute_xsd_type(attr, attr_type, register, rule)
    emit_xsd_attribute(xml, attr, rule, xsd_type, attr_type)
  end
end

.generate_complex_type(xml, klass, type_name, register, xml_mapping = nil, ctx:) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 508

def self.generate_complex_type(xml, klass, type_name, register, xml_mapping = nil, ctx:)
  xs(xml, "complexType", { name: type_name }) do
    if klass.attributes.any?
      xs(xml, "sequence") do
        generate_elements(xml, klass, register, xml_mapping, ctx: ctx)
      end
    end
    generate_attributes(xml, klass, register, xml_mapping)
  end
end

.generate_complex_type_content(xml, klass, register, xml_mapping, ctx:) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 494

def self.generate_complex_type_content(xml, klass, register, xml_mapping, ctx:)
  xs(xml, "complexType") do
    if klass.attributes.any?
      xs(xml, "sequence") do
        generate_elements(xml, klass, register, xml_mapping, ctx: ctx)
      end
    end
    if xml_mapping
      generate_attributes(xml, klass, register,
                          xml_mapping)
    end
  end
end

.generate_elements(xml, klass, register, xml_mapping, ctx:) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 519

def self.generate_elements(xml, klass, register, xml_mapping, ctx:)
  klass.attributes.each do |name, attr|
    next if xml_mapping && attr_is_xml_attribute?(xml_mapping, name)

    # Find the mapping rule for this attribute
    mapping_rule = xml_mapping&.find_element(name)

    attr_type = attr.type(register)

    if attr_type <= Lutaml::Model::Serialize
      # Nested model - check if it has a type_name for reference
      nested_mapping = attr_type.mappings_for(:xml)
      nested_type_name = nested_mapping&.type_name_value

      if attr.collection?
        # Collection of models
        element_attrs = { name: name.to_s }
        element_attrs[:minOccurs] = "0"
        element_attrs[:maxOccurs] = "unbounded"

        if nested_type_name
          # Reference named type by its owning namespace's prefix
          element_attrs[:type] = qualify_type_ref(
            nested_type_name,
            nested_ref_prefix(nested_mapping, ctx),
          )
          xs(xml, "element", element_attrs)
        else
          # Inline anonymous complexType
          xs(xml, "element", element_attrs) do
            xs(xml, "complexType") do
              xs(xml, "sequence") do
                xs(xml, "element",
                   { name: "item", type: get_xsd_type(attr_type) })
              end
            end
          end
        end
      elsif nested_type_name
        # Single nested model - reference by its owning namespace prefix
        xs(xml, "element",
           { name: name.to_s,
             type: qualify_type_ref(
               nested_type_name,
               nested_ref_prefix(nested_mapping, ctx),
             ) })
      else
        # Inline anonymous complexType
        xs(xml, "element", { name: name.to_s }) do
          generate_complex_type_content(xml, attr_type, register, nil,
                                        ctx: ctx)
        end
      end
    else
      # Value type
      xsd_type = get_attribute_xsd_type(attr, attr_type, register,
                                        mapping_rule)

      if attr.collection?
        # Collection of simple types
        element_attrs = { name: name.to_s }
        element_attrs[:minOccurs] = "0"
        element_attrs[:maxOccurs] = "unbounded"

        xs(xml, "element", element_attrs) do
          xs(xml, "complexType") do
            xs(xml, "sequence") do
              emit_value_element(xml, { name: "item" }, xsd_type,
                                 attr_type, attr)
            end
          end
        end
      else
        # Simple element
        element_attrs = build_element_attributes(name, xsd_type, attr,
                                                 xml_mapping, name)
        emit_value_element(xml, element_attrs, xsd_type, attr_type,
                           attr)
      end
    end
  end
end

.generate_imports(xml, namespace_class) ⇒ Object

Emit xs:import for each namespace the root's XmlNamespace class explicitly declares. Returns the Set of imported URIs so the tree import loop can dedupe against them.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 391

def self.generate_imports(xml, namespace_class)
  imported = Set.new
  return imported unless namespace_class.imports&.any?

  namespace_class.imports.each do |imported_ns|
    next unless imported.add?(imported_ns.uri)

    emit_import(xml, imported_ns)
  end

  imported
end

.generate_includes(xml, namespace_class) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 414

def self.generate_includes(xml, namespace_class)
  return unless namespace_class.includes&.any?

  namespace_class.includes.each do |schema_location|
    xs(xml, "include", { schemaLocation: schema_location })
  end
end

.generate_nested_type_definitions(xml, klass, register, ctx:, seen: nil) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 431

def self.generate_nested_type_definitions(xml, klass, register, ctx:, seen: nil)
  # Cycle guard, seeded with the root class (already defined by
  # generate_schema) so it is never redefined via a back-reference.
  seen ||= Set[klass]

  klass.attributes.each_value do |attr|
    attr_type = attr.type(register)
    next unless attr_type <= Lutaml::Model::Serialize

    nested_mapping = attr_type.mappings_for(:xml)

    # Skip models this document does not emit — checked before the cycle
    # guard so an unemitted reference never consumes the model's slot and
    # masks an emitted reference elsewhere. A collection of a type_name-
    # less model is a placeholder; an imported foreign type is defined in
    # its own schema document. A foreign model without a type_name is
    # inlined here, so we still descend to define the types it references.
    next if collection_placeholder?(attr, nested_mapping)
    next if imported_foreign_type?(nested_mapping, ctx.target_uri)
    next unless seen.add?(attr_type)

    nested_type_name = nested_mapping&.type_name_value
    if nested_type_name
      generate_complex_type(xml, attr_type, nested_type_name, register,
                            nested_mapping, ctx: ctx)
    end

    generate_nested_type_definitions(xml, attr_type, register,
                                     ctx: ctx, seen: seen)
  end
end

.generate_referenced_imports(xml, referenced, target_uri, imported_uris) ⇒ Object

xs:import for every referenced foreign namespace, deduped by URI against the explicit imports already emitted.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 379

def self.generate_referenced_imports(xml, referenced, target_uri, imported_uris)
  (referenced[:foreign_models] + referenced[:type_values]).each do |ns_class|
    next if ns_class.uri == target_uri
    next unless imported_uris.add?(ns_class.uri)

    emit_import(xml, ns_class)
  end
end

.generate_schema(xml, klass, xml_mapping, register, options) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 188

def self.generate_schema(xml, klass, xml_mapping, register, options)
  skip_validation = options[:skip_validation]

  # Bind the XSD vocabulary namespace to the "xs" prefix (via the
  # namespace object, not a hardcoded string) so the xs:-prefixed type
  # references and the prefixed structure elements are both declared.
  schema_attrs = { xsd_ns.attr_name.to_sym => xsd_ns.uri }
  schema_attrs.merge!(target_namespace_attrs(xml_mapping))
  target_uri = schema_attrs[:targetNamespace]

  referenced = referenced_namespaces(klass, register, target_uri)

  # Named-type references into the target namespace need a usable
  # prefix; synthesise a non-colliding one when the namespace class
  # declares none.
  target_prefix = target_ns_prefix(xml_mapping)
  if target_uri && target_prefix.nil?
    target_prefix = synthesize_target_prefix(referenced)
    schema_attrs[:"xmlns:#{target_prefix}"] = target_uri
  end

  declare_referenced_namespaces!(schema_attrs, referenced, target_uri,
                                 skip_validation)

  ctx = Context.new(target_prefix, target_uri)

  xs(xml, "schema", schema_attrs) do
    # Explicit imports declared on the root's XmlNamespace class.
    imported_uris = Set.new
    if xml_mapping.namespace_class
      imported_uris = generate_imports(xml, xml_mapping.namespace_class)
      generate_includes(xml, xml_mapping.namespace_class)
    end

    generate_referenced_imports(xml, referenced, target_uri,
                                imported_uris)

    if xml_mapping.documentation_text || xml_mapping.namespace_class&.documentation
      generate_annotation(xml, xml_mapping)
    end

    element_name = if has_explicit_xml_mapping?(klass, xml_mapping)
                     xml_mapping.element_name || xml_mapping.root_element
                   end

    type_name = xml_mapping.type_name_value

    # Generate XSD based on three patterns:
    # Pattern 1: element only -> inline anonymous complexType
    # Pattern 2: type_name only -> named complexType (no element)
    # Pattern 3: both element and type_name -> element + named complexType

    if element_name && type_name
      xs(xml, "element",
         { name: element_name,
           type: qualify_type_ref(type_name, target_prefix) })
      generate_complex_type(xml, klass, type_name, register,
                            xml_mapping, ctx: ctx)
    elsif type_name && !element_name
      generate_complex_type(xml, klass, type_name, register,
                            xml_mapping, ctx: ctx)
    else
      # Use class name as fallback element name if not specified
      elem_name = element_name || klass.name
      xs(xml, "element", { name: elem_name }) do
        generate_complex_type_content(xml, klass, register, xml_mapping,
                                      ctx: ctx)
      end
    end

    generate_nested_type_definitions(xml, klass, register, ctx: ctx)
  end
end

.get_attribute_xsd_type(attr, attr_type, register, _mapping_rule = nil) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 836

def self.get_attribute_xsd_type(attr, attr_type, register,
_mapping_rule = nil)
  if attr.union?
    raise Lutaml::Model::UnionSchemaUnsupportedError.new(attr.name,
                                                         "XSD")
  end

  # 1. Check for deprecated attribute-level xsd_type override
  return attr.options[:xsd_type] if attr.options[:xsd_type]

  # 2. Check if type has xsd_type method (Type-level)
  if attr_type.is_a?(Class) && attr_type < Lutaml::Model::Type::Value
    # Special handling for Reference type
    if attr_type == Lutaml::Model::Type::Reference
      target_xsd_type = get_target_xsd_type(attr, register)
      return attr_type.xsd_type(target_xsd_type)
    end

    return attr_type.xsd_type
  end

  # 3. Fall back to default mapping
  get_xsd_type(attr_type)
end

.get_namespace_info(klass) ⇒ Object

Namespace information for a Type::Value class (the only kind the namespace walk queries — nested models are handled structurally by referenced_namespaces). Returns {} for anything else.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 910

def self.get_namespace_info(klass)
  return {} unless klass.is_a?(::Class)

  if defined?(Lutaml::Model::Type::Value) &&
      klass <= Lutaml::Model::Type::Value
    return get_type_namespace_info(klass)
  end

  {}
end

.get_target_xsd_type(attr, register) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 942

def self.get_target_xsd_type(attr, register)
  return nil unless attr.options[:ref_model_class]
  return nil unless attr.options[:ref_key_attribute]

  begin
    model_class = Object.const_get(attr.options[:ref_model_class])
    target_attr = model_class.attributes[attr.options[:ref_key_attribute]]
    return nil unless target_attr

    target_type = target_attr.type(register)
    get_attribute_xsd_type(target_attr, target_type, register)
  rescue NameError
    nil
  end
end

.get_xsd_type(type) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 958

def self.get_xsd_type(type)
  {
    Lutaml::Model::Type::String => "xs:string",
    Lutaml::Model::Type::Integer => "xs:integer",
    Lutaml::Model::Type::Boolean => "xs:boolean",
    Lutaml::Model::Type::Float => "xs:float",
    Lutaml::Model::Type::Decimal => "xs:decimal",
    Lutaml::Model::Type::Date => "xs:date",
    Lutaml::Model::Type::Time => "xs:time",
    Lutaml::Model::Type::DateTime => "xs:dateTime",
    Lutaml::Model::Type::TimeWithoutDate => "xs:time",
    Lutaml::Model::Type::Duration => "xs:duration",
    Lutaml::Model::Type::Uri => "xs:anyURI",
    Lutaml::Model::Type::QName => "xs:QName",
    Lutaml::Model::Type::Base64Binary => "xs:base64Binary",
    Lutaml::Model::Type::HexBinary => "xs:hexBinary",
    Lutaml::Model::Type::Hash => "xs:anyType",
    Lutaml::Model::Type::Symbol => "xs:string",
  }[type] || "xs:string"
end

.has_explicit_xml_mapping?(klass, xml_mapping) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 829

def self.has_explicit_xml_mapping?(klass, xml_mapping)
  return true unless xml_mapping.root_element

  base_name = Lutaml::Model::Utils.base_class_name(klass)
  xml_mapping.root_element != base_name
end

.imported_foreign_type?(mapping, target_uri) ⇒ Boolean

Whether a nested model is referenced across a schema-document boundary: it lives in a foreign namespace AND exposes a named type, so it is referenced by a prefixed QName and resolved through an xs:import. A foreign model WITHOUT a type_name has no named type to reference, so generate_elements inlines it into this document — it is not a boundary, and both the namespace walk and the type-definition walk must descend into it rather than treat it as imported.

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 480

def self.imported_foreign_type?(mapping, target_uri)
  foreign_namespace?(mapping, target_uri) &&
    !mapping.type_name_value.nil?
end

.leading_backslash_run(source) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 745

def self.leading_backslash_run(source)
  run = 0
  run += 1 while source[run] == "\\"
  run
end

.lexical_value(type, value) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 794

def self.lexical_value(type, value)
  type.serialize(type.cast(value))
end

.missing_schema_location_error(ns_class) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 372

def self.missing_schema_location_error(ns_class)
  "XSD generation: foreign namespace '#{ns_class.uri}' needs a " \
    "schema_location so its imported types can be resolved."
end

.nested_ref_prefix(nested_mapping, ctx) ⇒ Object

The prefix a named-type reference should carry. A foreign model's type lives in its own namespace, so the ref uses that namespace's prefix; a model in the target namespace (same URI or none) is defined in this schema, so the ref uses the target prefix.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 79

def self.nested_ref_prefix(nested_mapping, ctx)
  ns_class = nested_mapping&.namespace_class
  return ctx.target_prefix unless ns_class
  return ctx.target_prefix if ns_class.uri == ctx.target_uri

  prefix = ns_class.prefix_default
  usable_prefix?(prefix) ? prefix : ctx.target_prefix
end

.pattern_value(regexp) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 701

def self.pattern_value(regexp)
  reject_unsupported_regex_flags!(regexp)
  source = strip_ruby_anchors(regexp.source)
  reject_invalid_xsd_pattern!(regexp, source)
  source
end

.prefix_collision_error(prefix, uri, schema_attrs) ⇒ Object

The collision message when prefix is already bound to a different namespace than uri in schema_attrs, or nil when there is no conflict.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 363

def self.prefix_collision_error(prefix, uri, schema_attrs)
  existing = schema_attrs[:"xmlns:#{prefix}"]
  return unless existing && existing != uri

  "XSD generation: namespace prefix '#{prefix}' is bound " \
    "to two different namespaces (#{existing} and #{uri}). " \
    "Give them distinct prefixes."
end

.qn(local) ⇒ Object

Qualify an XSD structure element name with the bound prefix, so the prefix used on emitted elements always matches the declared xmlns.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 25

def self.qn(local)
  "#{xsd_ns.prefix}:#{local}"
end

.qualify_type_ref(type_name, prefix) ⇒ Object

Qualify a named-type reference with the given prefix so it resolves to the namespace the type is defined in. Built-in refs (which already carry a prefix, e.g. "xs:string") and no-namespace schemas (prefix nil) are returned unchanged.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 68

def self.qualify_type_ref(type_name, prefix)
  return type_name if prefix.nil? || type_name.nil?
  return type_name if type_name.include?(":")

  "#{prefix}:#{type_name}"
end

.raise_inexpressible_pattern!(regexp, detail) ⇒ Object

Raises:



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 761

def self.raise_inexpressible_pattern!(regexp, detail)
  raise Lutaml::Model::Error,
        "Cannot export pattern #{regexp.inspect} to xs:pattern: " \
        "it is not expressible in XSD's regexp subset (#{detail})."
end

.referenced_namespaces(klass, register, target_uri, seen = Set.new) ⇒ Hash

Namespaces referenced by THIS schema document, collected by walking the model tree from the root class (structural, no instance needed). The walk stops at foreign-model boundaries: a foreign model's type is imported — defined in its own schema document — so namespaces used only inside it are that document's concern, not this one's.

Returns:

  • (Hash) —

    :foreign_models — namespace classes of directly referenced foreign models (their type refs are prefixed QNames resolved through an import); :type_values — namespace classes declared by Type::Value attribute types (imported so their verbatim xsd_type references can resolve). Both deduped by class.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 872

def self.referenced_namespaces(klass, register, target_uri, seen = Set.new)
  result = { foreign_models: [], type_values: [] }
  return result unless klass.is_a?(::Class) && seen.add?(klass)

  klass.attributes.each_value do |attr|
    type_class = attr.type(register)
    next unless type_class

    if type_class <= Lutaml::Model::Serialize
      mapping = type_class.mappings_for(:xml)
      if imported_foreign_type?(mapping, target_uri)
        result[:foreign_models] << mapping.namespace_class
      elsif collection_placeholder?(attr, mapping)
        # Placeholder collection: its content is never emitted, so it
        # contributes no namespaces to this document.
        next
      else
        nested = referenced_namespaces(type_class, register,
                                       target_uri, seen)
        result[:foreign_models].concat(nested[:foreign_models])
        result[:type_values].concat(nested[:type_values])
      end
    else
      ns = get_namespace_info(type_class)[:class]
      if ns.is_a?(::Class) && ns < Lutaml::Xml::Namespace
        result[:type_values] << ns
      end
    end
  end

  result[:foreign_models].uniq!
  result[:type_values].uniq!
  result
end

.reject_invalid_xsd_pattern!(regexp, source) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 767

def self.reject_invalid_xsd_pattern!(regexp, source)
  return unless defined?(::Nokogiri::XML::Schema)

  probe = <<~XSD
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
      <xs:simpleType name="p">
        <xs:restriction base="xs:string">
          <xs:pattern value="#{xsd_escape(source)}"/>
        </xs:restriction>
      </xs:simpleType>
    </xs:schema>
  XSD
  schema = ::Nokogiri::XML::Schema(probe)
  return if schema.errors.empty?

  raise_inexpressible_pattern!(regexp, schema.errors.first.message)
rescue ::Nokogiri::XML::SyntaxError => e
  raise_inexpressible_pattern!(regexp, e.message)
end

.reject_unsupported_regex_flags!(regexp) ⇒ Object

Raises:



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 708

def self.reject_unsupported_regex_flags!(regexp)
  return if regexp.options.nobits?(UNSUPPORTED_XSD_REGEX_FLAGS)

  raise Lutaml::Model::Error,
        "Cannot export pattern #{regexp.inspect} to xs:pattern: " \
        "the i/m/x flags are not expressible in XSD's regexp subset."
end

.strip_leading_anchor(source) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 721

def self.strip_leading_anchor(source)
  return source[1..] if source.start_with?("^")

  run = leading_backslash_run(source)
  return source unless run.odd? && source[run] == "A"

  # Keep the escaped-pair backslashes; drop the anchor's `\A`.
  source[0, run - 1] + source[(run + 1)..]
end

.strip_ruby_anchors(source) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 716

def self.strip_ruby_anchors(source)
  source = strip_leading_anchor(source)
  strip_trailing_anchor(source)
end

.strip_trailing_anchor(source) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 731

def self.strip_trailing_anchor(source)
  last = source[-1]
  before = source.length - 1
  if ["z", "Z"].include?(last) &&
      trailing_backslash_run(source, before).odd?
    return source[0...-2]
  end
  if last == "$" && trailing_backslash_run(source, before).even?
    return source[0...-1]
  end

  source
end

.synthesize_target_prefix(referenced) ⇒ Object

A synthetic prefix for a target namespace that declares none, avoiding every prefix claimed by a referenced namespace.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 293

def self.synthesize_target_prefix(referenced)
  taken = (referenced[:foreign_models] + referenced[:type_values])
    .filter_map(&:prefix_default)
  candidate = "tns"
  suffix = 0
  candidate = "tns#{suffix += 1}" while taken.include?(candidate)
  candidate
end

.target_namespace_attrs(xml_mapping) ⇒ Object

targetNamespace, form defaults, and the target xmlns declaration, derived from the root mapping's namespace configuration.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 264

def self.target_namespace_attrs(xml_mapping)
  attrs = {}

  if xml_mapping.namespace_class
    ns = xml_mapping.namespace_class
    attrs[:targetNamespace] = ns.uri
    attrs[:elementFormDefault] = ns.element_form_default.to_s
    attrs[:attributeFormDefault] = ns.attribute_form_default.to_s
    attrs[:version] = ns.version if ns.version

    prefix = xml_mapping.namespace_prefix || ns.prefix_default
    attrs[:"xmlns:#{prefix}"] = ns.uri if usable_prefix?(prefix)
  elsif xml_mapping.namespace_uri
    # Legacy: namespace URI without XmlNamespace class
    attrs[:targetNamespace] = xml_mapping.namespace_uri
    attrs[:elementFormDefault] = "unqualified"
    attrs[:attributeFormDefault] = "unqualified"

    if usable_prefix?(xml_mapping.namespace_prefix)
      attrs[:"xmlns:#{xml_mapping.namespace_prefix}"] =
        xml_mapping.namespace_uri
    end
  end

  attrs
end

.target_ns_prefix(xml_mapping) ⇒ Object

The prefix of the schema's target namespace, or nil when the schema has no target namespace (named types then live in no-namespace and their references stay unprefixed). Never returns the reserved "xs".



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 52

def self.target_ns_prefix(xml_mapping)
  prefix =
    if xml_mapping&.namespace_class
      xml_mapping.namespace_prefix ||
        xml_mapping.namespace_class.prefix_default
    elsif xml_mapping&.namespace_uri
      xml_mapping.namespace_prefix
    end

  prefix if usable_prefix?(prefix)
end

.trailing_backslash_run(source, pos) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 751

def self.trailing_backslash_run(source, pos)
  run = 0
  i = pos - 1
  while i >= 0 && source[i] == "\\"
    run += 1
    i -= 1
  end
  run
end

.type_resolvable?(type_name, klass, register) ⇒ Boolean

Check if a custom XSD type can be resolved in the model hierarchy

Parameters:

  • type_name (String) —

    The custom type name to resolve

  • klass (Class) —

    The model class being processed

  • register (Register) —

    The register for type resolution

Returns:

  • (Boolean) —

    true if the type can be resolved



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 133

def self.type_resolvable?(type_name, klass, register)
  # Search in nested model attributes
  klass.attributes.each_value do |attr|
    attr_type = attr.type(register)
    next unless attr_type <= Lutaml::Model::Serialize

    nested_mapping = attr_type.mappings_for(:xml)
    return true if nested_mapping&.type_name_value == type_name
  end

  false
end

.usable_prefix?(prefix) ⇒ Boolean

Whether a prefix can appear in emitted QNames: present and not the reserved XSD vocabulary prefix.

Returns:

  • (Boolean) 


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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 40

def self.usable_prefix?(prefix)
  !prefix.nil? && !prefix.empty? && prefix != xsd_ns.prefix
end

.validate_xsd_types!(klass, register, seen = Set.new) ⇒ Object

Validate all XSD types referenced by the model

Parameters:

  • klass (Class) —

    The model class to validate

  • register (Register) —

    The register for type resolution

Raises:

  • (UnresolvableTypeError) —

    if any types cannot be resolved



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 151

def self.validate_xsd_types!(klass, register, seen = Set.new)
  # Cycle guard: recursive models (A -> B -> A) would otherwise recurse
  # forever. A class already being validated needs no re-validation.
  return unless seen.add?(klass)

  errors = []

  klass.attributes.each do |name, attr|
    attr_type = attr.type(register)

    # Validate Type::Value xsd_type
    if attr_type.is_a?(Class) && attr_type < Lutaml::Model::Type::Value
      type_name = attr_type.xsd_type
      classification = classify_xsd_type(type_name, klass, register)

      if classification == :unresolvable
        errors << "Attribute '#{name}' uses unresolvable xsd_type '#{type_name}'. " \
                  "Custom types must be defined as LutaML Type::Value or Model classes."
      end
    end

    # Recursively validate nested models
    if attr_type <= Lutaml::Model::Serialize
      begin
        validate_xsd_types!(attr_type, register, seen)
      rescue Lutaml::Model::UnresolvableTypeError => e
        errors << "In nested model #{attr_type.name}: #{e.message}"
      end
    end
  end

  if errors.any?
    raise Lutaml::Model::UnresolvableTypeError,
          errors.join("\n")
  end
end

.xs(xml, local, attrs = nil, &block) ⇒ Object

Emit an XSD structure element (<xs:local ...>) through the builder.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 30

def self.xs(xml, local, attrs = nil, &block)
  if attrs
    xml.public_send(qn(local), attrs, &block)
  else
    xml.public_send(qn(local), &block)
  end
end

.xsd_escape(text) ⇒ Object 



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 790

def self.xsd_escape(text)
  text.gsub("&", "&amp;").gsub("<", "&lt;").gsub('"', "&quot;")
end

.xsd_ns ⇒ Object

The XSD vocabulary namespace, routed through the project's namespace object so the declared prefix and every emitted prefix stay in sync. W3c::XsNamespace binds "xs" (matching the built-in xs:-prefixed type references) and opts out of the W3C-reserved-prefix warning.



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# File 'lib/lutaml/xml/schema/xsd_schema.rb', line 19

def self.xsd_ns
  @xsd_ns ||= Lutaml::Xml::W3c::XsNamespace.new
end