1xmerl_xsd(3) Erlang Module Definition xmerl_xsd(3)
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6 xmerl_xsd - Interface module for XML Schema validation.
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9 Interface module for XML Schema validation. It handles the W3.org spec‐
10 ifications of XML Schema second edition 28 october 2004. For an intro‐
11 duction to XML Schema study part 0. An XML structure is validated by
12 xmerl_xsd:validate/[2,3].
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15 filename() = string():
16 global_state():
19 The global state of the validator. It is representated by the
22 #xsd_state{} record.
23 option_list():
25 Options allow to customize the behaviour of the validation.
28 Possible options are :
30 {tab2file,boolean()}:
32 Enables saving of abstract structure on file for debugging pur‐
33 pose.
34 {xsdbase,filename()}:
36 XSD Base directory.
37 {fetch_fun,FetchFun}:
39 Call back function to fetch an external resource.
40 {fetch_path,PathList}:
42 PathList is a list of directories to search when fetching files.
43 If the file in question is not in the fetch_path, the URI will be
44 used as a file name.
45 {state,State}:
47 It is possible by this option to provide a state with process in‐
48 formation from an earlier validation.
49
51 file2state(FileName) -> {ok, State} | {error, Reason}
52 Types:
54 State = global_state()
56 FileName = string()
57 Reads the schema state with all information of the processed
59 schema from a file created with state2file/[1,2]. The format of
60 this file is internal. The state can then be used validating an
61 XML document.
62 format_error(L::Errors) -> Result
64 Types:
66 Errors = tuple() | [tuple()]
68 Result = string() | [string()]
69 Formats error descriptions to human readable strings.
71 process_schema(Schema) -> Result
73 Equivalent to process_schema(Schema, []).
75 process_schema(Schema, Options) -> Result
77 Types:
79 Schema = string()
81 Result = {ok, State} | {error, Reason}
82 State = global_state()
83 Reason = [ErrorReason] | ErrorReason
84 Options = option_list()
85 Reads the referenced XML schema and checks that it is valid. Re‐
87 turns the global_state() with schema info or an error reason.
88 The error reason may be a list of several errors or a single er‐
89 ror encountered during the processing.
90 process_schemas(Schemas) -> Result
92 Equivalent to process_schema(Schemas, []).
94 process_schemas(Schemas, Options) -> Result
96 Types:
98 Schemas = [{NameSpace, string()} | Schemas] | []
100 Result = {ok, State} | {error, Reason}
101 Reason = [ErrorReason] | ErrorReason
102 Options = option_list()
103 Reads the referenced XML schemas and controls they are valid.
105 Returns the global_state() with schema info or an error reason.
106 The error reason may be a list of several errors or a single er‐
107 ror encountered during the processing.
108 process_validate(Schema, Xml::Element) -> Result
110 Equivalent to process_validate(Schema, Xml, []).
112 process_validate(Schema, Xml::Element, Opts::Options) -> Result
114 Types:
116 Schema = string()
118 Element = XmlElement
119 Options = option_list()
120 Result = {ValidXmlElement, State} | {error, Reason}
121 Reason = [ErrorReason] | ErrorReason
122 Validates a parsed well-formed XML element towards an XML
124 schema.
125 Validates in two steps. First it processes the schema, saves the
127 type and structure info in an ets table and then validates the
128 element towards the schema.
129 Usage example:
131 1>{E,_} = xmerl_scan:file("my_XML_document.xml").
133 2>{E2,_} = xmerl_xsd:validate("my_XML_Schema.xsd",E).
134 Observe that E2 may differ from E if for instance there are de‐
136 fault values defined in my_XML_Schema.xsd.
137 state2file(S::State) -> ok | {error, Reason}
139 Same as state2file(State,SchemaName)
141 The name of the saved file is the same as the name of the
143 schema, but with .xss extension.
144 state2file(S::State, FileName) -> ok | {error, Reason}
146 Types:
148 State = global_state()
150 FileName = string()
151 Saves the schema state with all information of the processed
153 schema in a file. You can provide the file name for the saved
154 state. FileName is saved with the .xss extension added.
155 validate(Xml::Element, State) -> Result
157 Equivalent to validate(Element, State, []).
159 validate(Xml::Element, State, Opts::Options) -> Result
161 Types:
163 Element = XmlElement
165 Options = option_list()
166 Result = {ValidElement, global_state()} | {error, Reasons}
167 ValidElement = XmlElement
168 State = global_state()
169 Reasons = [ErrorReason] | ErrorReason
170 Validates a parsed well-formed XML element (Element).
172 A call to validate/2 or validate/3 must provide a well formed
174 parsed XML element #xmlElement{} and a State, global_state(),
175 which holds necessary information from an already processed
176 schema. Thus validate enables reuse of the schema information
177 and therefore if one shall validate several times towards the
178 same schema it reduces time consumption.
179 The result, ValidElement, is the valid element that conforms to
181 the post-schema-validation infoset. When the validator finds an
182 error it tries to continue and reports a list of all errors
183 found. In those cases an unexpected error is found it may cause
184 a single error reason.
185 Usage example:
187 1>{E,_} = xmerl_scan:file("my_XML_document.xml").
189 2>{ok,S} = xmerl_xsd:process_schema("my_XML_Schema.xsd").
190 3>{E2,_} = xmerl_xsd:validate(E,S).
191 Observe that E2 may differ from E if for instance there are de‐
193 fault values defined in my_XML_Schema.xsd.
194
196 <>
197 xmerl 1.3.28 xmerl_xsd(3)