How's my XML schema?

[ITAmember]

It's my first time making an XML schema so I wanted to make sure I'm doing it right. Critiques and comments are more then welcome.

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="[URL unfurl="true"]http://www.w3.org/2001/XMLSchema"[/URL] targetNamespace="[URL unfurl="true"]http://www.w3schools.com"[/URL] xmlns="[URL unfurl="true"]http://www.w3schools.com"[/URL] elementFormDefault="qualified">

	<xs:complexType name="genreList">
		<xs:restriction base="xs:string">
			<xs:pattern value="a|b"/> <!--make comprehensive-->
		</xs:restriction>
	</xs:complexType>
	
	<xs:complexType name="languageList">
		<xs:restriction base="xs:string">
			<xs:pattern value="a|b"/> <!--make comprehensive-->
		</xs:restriction>
	</xs:complexType>

	<xs:element name="name"> <!--need a name for my new format-->
		<xs:complexType>
			<sequence>
				<xs:element name="album" maxOccurs="1">
					<xs:complexType>
						<xs:element name="metadata">
							<xs:complexType>
								<xs:sequence>
									<xs:element name="content"> <!--needs better name-->
										<xs:complexType>
											<xs:sequence>
												<xs:element name="title"    type="xs:string"/>
												<xs:element name="genre"    type="genreList"/>
												<xs:element name="year"     type="xs:integer"/>
												<xs:element name="bpm"      type="xs:integer"/>
												<xs:element name="length"   type="xs:time"/>
												<xs:element name="language" type="languageList"/>
											</xs:sequence>
										</xs:complexType>
									</xs:element>
									
									<xs:element name="involvedPersons">
										<xs:complexType>
											<xs:sequence>
												<xs:element name="artist"         type="xs:string"/>
												<xs:element name="accompaniment"  type="xs:string"/>
												<xs:element name="remix"          type="xs:string"/>
												<xs:element name="originalArtist" type="xs:string"/>
												<xs:element name="lyricist"       type="xs:string"/>
												<xs:element name="composer"       type="xs:string"/>
												<xs:element name="conductor"      type="xs:string"/>
												<xs:element name="musicianList"/>
													<xs:complexType>
														<xs:element name="person">
															<xs:complexType>
																<xs:element name="name"       type="xs:string" maxOccurs="1"/>
																<xs:element name="instrument" type="xs:string" maxOccurs="unbounded"/>
															</xs:complexType>
														</xs:element>
													</xs:complexType>
												<xs:element name="involvedList"  type="xs:string"/>
													<xs:complexType>
														<xs:element name="person">
															<xs:complexType>
																<xs:element name="name" type="xs:string" maxOccurs="1"/>
																<xs:element name="role" type="xs:string" maxOccurs="unbounded"/>
															</xs:complexType>
														</xs:element>
													</xs:complexType>
												<xs:element name="encodedBy"      type="xs:string"/>
											</xs:sequence>
										</xs:complexType>
									</xs:element>
									
									<xs:element name="pictures" minOccurs="0"> <!--force PNG?-->
										<xs:complexType>
											<xs:sequence>
												<xs:element name="frontCover"        type="base64Binary" minOccurs="0"/>
												<xs:element name="backCover"         type="base64Binary" minOccurs="0"/>
												<xs:element name="fileIcon"          type="base64Binary" minOccurs="0"/>
												<xs:element name="leafletPage"       type="base64Binary" minOccurs="0"/>
												<xs:element name="media"             type="base64Binary" minOccurs="0"/>
												<xs:element name="leadArtist"        type="base64Binary" minOccurs="0"/>
												<xs:element name="artist"            type="base64Binary" minOccurs="0"/>
												<xs:element name="conductor"         type="base64Binary" minOccurs="0"/>
												<xs:element name="accompaniment"     type="base64Binary" minOccurs="0"/>
												<xs:element name="composer"          type="base64Binary" minOccurs="0"/>
												<xs:element name="lyricist"          type="base64Binary" minOccurs="0"/>
												<xs:element name="recordingLocation" type="base64Binary" minOccurs="0"/>
												<xs:element name="recording"         type="base64Binary" minOccurs="0"/>
												<xs:element name="performance"       type="base64Binary" minOccurs="0"/>
												<xs:element name="illustration"      type="base64Binary" minOccurs="0"/>
												<xs:element name="artistLogotype"    type="base64Binary" minOccurs="0"/>
												<xs:element name="publisherLogotype" type="base64Binary" minOccurs="0"/>
												
												
											</xs:sequence>
										</xs:complexType>
									</xs:element>
								</xs:sequence>
							</xs:complexType>
						</xs:element>
					</xs:complexType>
				</xs:element>

				<xs:element name="track" maxOccurs="unbounded">
					<xs:complexType>
						<xs:sequence>
							<xs:element name="number" type="xs:integer"/>
							<xs:element name="title"  type="xs:string" />
							<xs:element name="file">
								<xs:complexType>
									<xs:sequence>
										<xs:element name="name"  type="xs:string" minOccurs="0"/>
										<xs:element name="start" type="xs:string" minOccurs="0"/> <!--MSF-->
										<xs:element name="break" type="xs:string" minOccurs="0" maxOccurs="unbounded"/> <!--MSF-->
										<xs:element name="end"   type="xs:string" minOccurs="0"/> <!--MSF-->
									</xs:sequence>
								</xs:complexType>
							</xs:element>
						</xs:sequence>
					</xs:complexType>
				</xs:element>
			</sequence>
		</xs:complexType>
	</xs:element>

</xs:schema>

 

[tsuji]

[0] Add a version to xs:schema.
[1] base64Binary data type belongs to schema namespace, it should be read xs:base64Binary.
[2] xs:element musicianList and involvedList are not meant to be empty. They should wrap around the xs:complexType following them.
[3] sequence is in xs namespace. It should be read xs:sequence. (This happened right under xs:element name.)
[4] xs:complexType should not be followed directly by xs:element. There should be some model group element, such as xs:sequence, that is what I think you meant. (These happened near the musicianList and involveList.)

 

[ITAmember]

Thank you!

A couple more questions:

How do I edit my post? (I would like to add the updated schema there vs making this thread huge) I don't see an edit button anywhere.

Is 0.01 Ok for the schema version? All the examples I've seen have been in the X.X format but I will go though a lot of revisions before the big 1.0 release.

How much filesize overhead will xs:base64Binary have?

How would I make a type in the M:S:F format where M is a number from 0 to infinity, S is a number from 0 to 59, and F is a number from 0 to 74? It looks like I need a weird combination of xsattern and xs:maxInclusive/xs:minInclusive.


Once again, thank you for your help.

 

[tsuji]

Q1:>How do I edit my post?
A1: You do not do that here.

Q2:>Is 0.01 Ok for the schema version?
A2: The version in question is the version of the w3c xml schema used. It should be [tt]version="1.0"[/tt] (unless you want to use 1.1 now available but the use and support are not wide-spread yet.)

Q3:>How much filesize overhead will xs:base64Binary have?
A3: Without being academic, 6 bits of binary are mapped to 8-bit character code. Hence an expansion of 3:4, plus some contingent minor overhead of paddings and line breaks.

Q4:>How would I make a type in the M:S:F format where M is a number from 0 to infinity, S is a number from 0 to 59, and F is a number from 0 to 74?
A4: Something like this in the restriction pattern.
[tt] <xsattern value="(0|[1-9][0-9]*)[0-9]|[1-4][0-9]|5[0-9])[0-9]|[1-6][0-9]|7[0-4])" />[/tt]

 

[ITAmember]

Great! Thank you!