<?xml version="1.0" encoding="UTF-8"?>
<!--                                                             -->
<!-- phyloXML                                                    -->
<!--                                                             -->
<!-- schema in XMLSchema                                         -->
<!--                                                             -->
<!-- License: The phyloXML XML Schema Definition is              -->
<!--          dual-licensed under the LGPL or Ruby's             -->
<!--          License.                                           -->
<!--          You can redistribute and/or modify                 -->
<!--          it under either the terms of the LGPL,             -->
<!--          or Ruby's License.                                 -->
<!--          see: http://www.ruby-lang.org/en/about/license.txt -->
<!--                                                             -->
<!-- Copyright (c) 2008-2013 Christian Zmasek                    -->
<!--                                                             -->
<!-- www.phyloxml.org                                            -->
<!-- Version: 1.16                                               -->
<!-- Last modified: 2013.09.30 by Christian  Zmasek              -->
<!--                                                             -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:phy="http://www.phyloxml.org"
   targetNamespace="http://www.phyloxml.org" elementFormDefault="qualified" attributeFormDefault="unqualified">
   <xs:annotation>
      <xs:documentation> phyloXML is an XML language to describe evolutionary trees and associated data. Version: 1.10.
         License: dual-licensed under the LGPL or Ruby's License. Copyright (c) 2008-2011 Christian M Zmasek.</xs:documentation>
   </xs:annotation>
   <!-- phyloxml is the root element:-->
   <xs:element name="phyloxml" type="phy:Phyloxml"/>
   <!-- phyloXML definition:-->
   <xs:complexType name="Phyloxml">
      <xs:annotation>
         <xs:documentation> 'phyloxml' is the name of the root element. Phyloxml contains an arbitrary number of
            'phylogeny' elements (each representing one phylogeny) possibly followed by elements from other namespaces.
         </xs:documentation>
      </xs:annotation>
      <xs:sequence maxOccurs="unbounded">
         <xs:element name="phylogeny" type="phy:Phylogeny" minOccurs="0" maxOccurs="unbounded"/>
         <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" namespace="##other"/>
      </xs:sequence>
   </xs:complexType>
   <!-- Phylogeny:-->
   <xs:complexType name="Phylogeny">
      <xs:annotation>
         <xs:documentation> Element Phylogeny is used to represent a phylogeny. The required attribute 'rooted' is used
            to indicate whether the phylogeny is rooted or not. The attribute 'rerootable' can be used to indicate that
            the phylogeny is not allowed to be rooted differently (i.e. because it is associated with root dependent
            data, such as gene duplications). The attribute 'type' can be used to indicate the type of phylogeny (i.e.
            'gene tree'). It is recommended to use the attribute 'branch_length_unit' if the phylogeny has branch
            lengths. Element clade is used in a recursive manner to describe the topology of a phylogenetic
         tree.</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="name" type="xs:token" minOccurs="0"/>
         <xs:element name="id" type="phy:Id" minOccurs="0"/>
         <xs:element name="description" type="xs:token" minOccurs="0"/>
         <xs:element name="date" type="xs:dateTime" minOccurs="0"/>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="clade" type="phy:Clade" minOccurs="0"/>
         <xs:element name="clade_relation" type="phy:CladeRelation" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="sequence_relation" type="phy:SequenceRelation" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="property" type="phy:Property" minOccurs="0" maxOccurs="unbounded"/>
         <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" namespace="##other"/>
      </xs:sequence>
      <xs:attribute name="rooted" type="xs:boolean" use="required"/>
      <xs:attribute name="rerootable" type="xs:boolean"/>
      <xs:attribute name="branch_length_unit" type="xs:token"/>
      <xs:attribute name="type" type="xs:token"/>
   </xs:complexType>
   <!-- Clade:-->
   <xs:complexType name="Clade">
      <xs:annotation>
         <xs:documentation> Element Clade is used in a recursive manner to describe the topology of a phylogenetic tree.
            The parent branch length of a clade can be described either with the 'branch_length' element or the
            'branch_length' attribute (it is not recommended to use both at the same time, though). Usage of the
            'branch_length' attribute allows for a less verbose description. Element 'confidence' is used to indicate
            the support for a clade/parent branch. Element 'events' is used to describe such events as gene-duplications
            at the root node/parent branch of a clade. Element 'width' is the branch width for this clade (including
            parent branch). Both 'color' and 'width' elements apply for the whole clade unless overwritten in-sub
            clades. Attribute 'id_source' is used to link other elements to a clade (on the xml-level).
         </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="name" type="xs:token" minOccurs="0"/>
         <xs:element name="branch_length" type="xs:double" minOccurs="0"/>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="width" type="xs:double" minOccurs="0"/>
         <xs:element name="color" type="phy:BranchColor" minOccurs="0"/>
         <xs:element name="taxonomy" type="phy:Taxonomy" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="sequence" type="phy:Sequence" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="events" type="phy:Events" minOccurs="0"/>
         <xs:element name="binary_characters" type="phy:BinaryCharacters" minOccurs="0"/>
         <xs:element name="distribution" type="phy:Distribution" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="date" type="phy:Date" minOccurs="0"/>
         <xs:element name="reference" type="phy:Reference" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="property" type="phy:Property" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="clade" type="phy:Clade" minOccurs="0" maxOccurs="unbounded"/>
         <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" namespace="##other"/>
      </xs:sequence>
      <xs:attribute name="branch_length" type="xs:double"/>
      <xs:attribute name="id_source" type="phy:id_source"/>
      <xs:attribute name="collapse" type="xs:boolean"/>
   </xs:complexType>
   <!-- Taxonomy:-->
   <xs:complexType name="Taxonomy">
      <xs:annotation>
         <xs:documentation> Element Taxonomy is used to describe taxonomic information for a clade. Element 'code' is
            intended to store UniProt/Swiss-Prot style organism codes (e.g. 'APLCA' for the California sea hare 'Aplysia
            californica') or other styles of mnemonics (e.g. 'Aca'). Element 'authority' is used to keep the authority,
            such as 'J. G. Cooper, 1863', associated with the 'scientific_name'. Element 'id' is used for a unique
            identifier of a taxon (for example '6500' with 'ncbi_taxonomy' as 'provider' for the California sea hare).
            Attribute 'id_source' is used to link other elements to a taxonomy (on the xml-level).</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="id" type="phy:Id" minOccurs="0"/>
         <xs:element name="code" type="phy:TaxonomyCode" minOccurs="0"/>
         <xs:element name="scientific_name" type="xs:token" minOccurs="0"/>
         <xs:element name="authority" type="xs:token" minOccurs="0"/>
         <xs:element name="common_name" type="xs:token" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="synonym" type="xs:token" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="rank" type="phy:Rank" minOccurs="0"/>
         <xs:element name="uri" type="phy:Uri" minOccurs="0" maxOccurs="unbounded"/>
         <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" namespace="##other"/>
      </xs:sequence>
      <xs:attribute name="id_source" type="phy:id_source"/>
   </xs:complexType>
   <xs:simpleType name="TaxonomyCode">
      <xs:restriction base="xs:token">
         <xs:pattern value="([A-Z9][A-Z]{2}[A-Z0-9]{2})|RAT|PIG|PEA"/>
      </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="Rank">
      <xs:restriction base="xs:token">
         <xs:enumeration value="domain"/>
         <xs:enumeration value="superkingdom"/>
         <xs:enumeration value="kingdom"/>
         <xs:enumeration value="subkingdom"/>
         <xs:enumeration value="branch"/>
         <xs:enumeration value="infrakingdom"/>
         <xs:enumeration value="superphylum"/>
         <xs:enumeration value="phylum"/>
         <xs:enumeration value="subphylum"/>
         <xs:enumeration value="infraphylum"/>
         <xs:enumeration value="microphylum"/>
         <xs:enumeration value="superdivision"/>
         <xs:enumeration value="division"/>
         <xs:enumeration value="subdivision"/>
         <xs:enumeration value="infradivision"/>
         <xs:enumeration value="superclass"/>
         <xs:enumeration value="class"/>
         <xs:enumeration value="subclass"/>
         <xs:enumeration value="infraclass"/>
         <xs:enumeration value="superlegion"/>
         <xs:enumeration value="legion"/>
         <xs:enumeration value="sublegion"/>
         <xs:enumeration value="infralegion"/>
         <xs:enumeration value="supercohort"/>
         <xs:enumeration value="cohort"/>
         <xs:enumeration value="subcohort"/>
         <xs:enumeration value="infracohort"/>
         <xs:enumeration value="magnorder"/>
         <xs:enumeration value="superorder"/>
         <xs:enumeration value="order"/>
         <xs:enumeration value="suborder"/>
         <xs:enumeration value="infraorder"/>
         <xs:enumeration value="superfamily"/>
         <xs:enumeration value="family"/>
         <xs:enumeration value="subfamily"/>
         <xs:enumeration value="supertribe"/>
         <xs:enumeration value="tribe"/>
         <xs:enumeration value="subtribe"/>
         <xs:enumeration value="infratribe"/>
         <xs:enumeration value="genus"/>
         <xs:enumeration value="subgenus"/>
         <xs:enumeration value="superspecies"/>
         <xs:enumeration value="species"/>
         <xs:enumeration value="subspecies"/>
         <xs:enumeration value="variety"/>
         <xs:enumeration value="varietas"/>
         <xs:enumeration value="subvariety"/>
         <xs:enumeration value="form"/>
         <xs:enumeration value="subform"/>
         <xs:enumeration value="cultivar"/>
         <xs:enumeration value="strain"/>
         <xs:enumeration value="section"/>
         <xs:enumeration value="subsection"/>
         <xs:enumeration value="unknown"/>
         <xs:enumeration value="other"/>
      </xs:restriction>
   </xs:simpleType>
   <!-- Sequence:-->
   <xs:complexType name="Sequence">
      <xs:annotation>
         <xs:documentation> Element Sequence is used to represent a molecular sequence (Protein, DNA, RNA) associated
            with a node. 'symbol' is a short (maximal 20 characters) symbol of the sequence (e.g. 'ACTM') whereas
            'name' is used for the full name (e.g. 'muscle Actin'). 'gene_name' can be used when protein and gene names differ.
            'location' is used for the location of a sequence on a genome/chromosome. The actual sequence can be stored with the 
            'mol_seq' element. Attribute 'type' is used to indicate the type of sequence ('dna', 'rna', or 'protein'). 
            One intended use for 'id_ref' is to link a sequence to a taxonomy (via the taxonomy's 'id_source') in case 
            of multiple sequences and taxonomies per node. </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="symbol" type="phy:SequenceSymbol" minOccurs="0"/>
         <xs:element name="accession" type="phy:Accession" minOccurs="0"/>
         <xs:element name="name" type="xs:token" minOccurs="0"/>
         <xs:element name="gene_name" type="xs:token" minOccurs="0"/>
         <xs:element name="location" type="xs:token" minOccurs="0"/>
         <xs:element name="mol_seq" type="phy:MolSeq" minOccurs="0"/>
         <xs:element name="uri" type="phy:Uri" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="annotation" type="phy:Annotation" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="cross_references" type="phy:CrossReferences" minOccurs="0"/>
         <xs:element name="domain_architecture" type="phy:DomainArchitecture" minOccurs="0"/>
         <xs:any minOccurs="0" maxOccurs="unbounded" processContents="lax" namespace="##other"/>
      </xs:sequence>
      <xs:attribute name="type" type="phy:SequenceType"/>
      <xs:attribute name="id_source" type="phy:id_source"/>
      <xs:attribute name="id_ref" type="phy:id_ref"/>
   </xs:complexType>
   <xs:simpleType name="SequenceSymbol">
      <xs:restriction base="xs:token">
         <xs:pattern value="\S{1,20}"/>
      </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="MolSeq">
      <xs:annotation>
         <xs:documentation> Element 'mol_seq' is used to store molecular sequences. The 'is_aligned' attribute is used
            to indicated that this molecular sequence is aligned with all other sequences in the same phylogeny for
            which 'is aligned' is true as well (which, in most cases, means that gaps were introduced, and that all
            sequences for which 'is aligned' is true must have the same length).</xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:token">
            <xs:attribute name="is_aligned" type="xs:boolean"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <xs:simpleType name="SequenceType">
      <xs:restriction base="xs:token">
         <xs:enumeration value="rna"/>
         <xs:enumeration value="dna"/>
         <xs:enumeration value="protein"/>
      </xs:restriction>
   </xs:simpleType>
   <!-- Accession:-->
   <xs:complexType name="Accession">
      <xs:annotation>
         <xs:documentation> Element Accession is used to capture the local part in a sequence identifier (e.g. 'P17304'
            in 'UniProtKB:P17304', in which case the 'source' attribute would be 'UniProtKB'). </xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:token">
            <xs:attribute name="source" type="xs:token" use="required"/>
            <xs:attribute name="comment" type="xs:token"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <!-- CrossReferences: -->
   <xs:complexType name="CrossReferences">
      <xs:annotation>
         <xs:documentation> Used to store accessions to additional resources. </xs:documentation>
      </xs:annotation> 
      <xs:sequence>
         <xs:element name="accession" type="phy:Accession" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
   </xs:complexType> 
   <!-- DomainArchitecture: -->
   <xs:complexType name="DomainArchitecture">
      <xs:annotation>
         <xs:documentation> This is used describe the domain architecture of a protein. Attribute 'length' is the total
            length of the protein</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="domain" type="phy:ProteinDomain" minOccurs="1" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="length" type="xs:nonNegativeInteger"/>
   </xs:complexType>
   <xs:complexType name="ProteinDomain">
      <xs:annotation>
         <xs:documentation> To represent an individual domain in a domain architecture. The name/unique identifier is
            described via the 'id' attribute. 'confidence' can be used to store (i.e.) E-values.</xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:token">
            <xs:attribute name="from" type="xs:nonNegativeInteger" use="required"/>
            <xs:attribute name="to" type="xs:nonNegativeInteger" use="required"/>
            <xs:attribute name="confidence" type="xs:double"/>
            <xs:attribute name="id" type="xs:token"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <!-- Events:-->
   <xs:complexType name="Events">
      <xs:annotation>
         <xs:documentation> Events at the root node of a clade (e.g. one gene duplication). </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="type" type="phy:EventType" minOccurs="0"/>
         <xs:element name="duplications" type="xs:nonNegativeInteger" minOccurs="0"/>
         <xs:element name="speciations" type="xs:nonNegativeInteger" minOccurs="0"/>
         <xs:element name="losses" type="xs:nonNegativeInteger" minOccurs="0"/>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0"/>
      </xs:sequence>
   </xs:complexType>
   <xs:simpleType name="EventType">
      <xs:restriction base="xs:token">
         <xs:enumeration value="transfer"/>
         <xs:enumeration value="fusion"/>
         <xs:enumeration value="speciation_or_duplication"/>
         <xs:enumeration value="other"/>
         <xs:enumeration value="mixed"/>
         <xs:enumeration value="unassigned"/>
      </xs:restriction>
   </xs:simpleType>
   <!--BinaryCharacters:-->
   <xs:complexType name="BinaryCharacters">
      <xs:annotation>
         <xs:documentation> The names and/or counts of binary characters present, gained, and lost at the root of a
            clade. </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="gained" type="phy:BinaryCharacterList" minOccurs="0"/>
         <xs:element name="lost" type="phy:BinaryCharacterList" minOccurs="0"/>
         <xs:element name="present" type="phy:BinaryCharacterList" minOccurs="0"/>
         <xs:element name="absent" type="phy:BinaryCharacterList" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="type" type="xs:token"/>
      <xs:attribute name="gained_count" type="xs:nonNegativeInteger"/>
      <xs:attribute name="lost_count" type="xs:nonNegativeInteger"/>
      <xs:attribute name="present_count" type="xs:nonNegativeInteger"/>
      <xs:attribute name="absent_count" type="xs:nonNegativeInteger"/>
   </xs:complexType>
   <xs:complexType name="BinaryCharacterList">
      <xs:sequence>
         <xs:element name="bc" type="xs:token" maxOccurs="unbounded"/>
      </xs:sequence>
   </xs:complexType>
   <!-- Reference:-->
   <xs:complexType name="Reference">
      <xs:annotation>
         <xs:documentation> A literature reference for a clade. It is recommended to use the 'doi' attribute instead of
            the free text 'desc' element whenever possible. </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="desc" type="xs:token" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="doi" type="xs:token"/>
   </xs:complexType>
   <!-- Annotation:-->
   <xs:complexType name="Annotation">
      <xs:annotation>
         <xs:documentation> The annotation of a molecular sequence. It is recommended to annotate by using the optional
            'ref' attribute (some examples of acceptable values for the ref attribute: 'GO:0008270',
            'KEGG:Tetrachloroethene degradation', 'EC:1.1.1.1'). Optional element 'desc' allows for a free text
            description. Optional element 'confidence' is used to state the type and value of support for a annotation.
            Similarly, optional attribute 'evidence' is used to describe the evidence for a annotation as free text
            (e.g. 'experimental'). Optional element 'property' allows for further, typed and referenced annotations from
            external resources.</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="desc" type="xs:token" minOccurs="0"/>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0"/>
         <xs:element name="property" type="phy:Property" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="uri" type="phy:Uri" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute name="ref" type="phy:ref"/>
      <xs:attribute name="source" type="xs:token"/>
      <xs:attribute name="evidence" type="xs:token"/>
      <xs:attribute name="type" type="xs:token"/>
   </xs:complexType>
   <!-- Property:-->
   <xs:complexType name="Property" mixed="true">
      <xs:annotation>
         <xs:documentation> Property allows for typed and referenced properties from external resources to be attached
            to 'Phylogeny', 'Clade', and 'Annotation'. The value of a property is its mixed (free text) content.
            Attribute 'datatype' indicates the type of a property and is limited to xsd-datatypes (e.g. 'xsd:string',
            'xsd:boolean', 'xsd:integer', 'xsd:decimal', 'xsd:float', 'xsd:double', 'xsd:date', 'xsd:anyURI'). Attribute
            'applies_to' indicates the item to which a property applies to (e.g. 'node' for the parent node of a clade,
            'parent_branch' for the parent branch of a clade). Attribute 'id_ref' allows to attached a property
            specifically to one element (on the xml-level). Optional attribute 'unit' is used to indicate the unit of
            the property. An example: &lt;property datatype="xsd:integer" ref="NOAA:depth" applies_to="clade"
            unit="METRIC:m"&gt; 200 &lt;/property&gt; </xs:documentation>
      </xs:annotation>
      <xs:attribute name="ref" type="phy:ref" use="required"/>
      <xs:attribute name="unit" type="phy:ref"/>
      <xs:attribute name="datatype" type="phy:PropertyDataType" use="required"/>
      <xs:attribute name="applies_to" type="phy:AppliesTo" use="required"/>
      <xs:attribute name="id_ref" type="phy:id_ref"/>
   </xs:complexType>
   <xs:simpleType name="ref">
      <xs:restriction base="xs:token">
         <xs:pattern value="[a-zA-Z0-9_]+:\S+"/>
      </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="AppliesTo">
      <xs:restriction base="xs:token">
         <xs:enumeration value="phylogeny"/>
         <xs:enumeration value="clade"/>
         <xs:enumeration value="node"/>
         <xs:enumeration value="annotation"/>
         <xs:enumeration value="parent_branch"/>
         <xs:enumeration value="other"/>
      </xs:restriction>
   </xs:simpleType>
   <xs:simpleType name="PropertyDataType">
      <xs:restriction base="xs:token">
         <xs:enumeration value="xsd:string"/>
         <xs:enumeration value="xsd:boolean"/>
         <xs:enumeration value="xsd:decimal"/>
         <xs:enumeration value="xsd:float"/>
         <xs:enumeration value="xsd:double"/>
         <xs:enumeration value="xsd:duration"/>
         <xs:enumeration value="xsd:dateTime"/>
         <xs:enumeration value="xsd:time"/>
         <xs:enumeration value="xsd:date"/>
         <xs:enumeration value="xsd:gYearMonth"/>
         <xs:enumeration value="xsd:gYear"/>
         <xs:enumeration value="xsd:gMonthDay"/>
         <xs:enumeration value="xsd:gDay"/>
         <xs:enumeration value="xsd:gMonth"/>
         <xs:enumeration value="xsd:hexBinary"/>
         <xs:enumeration value="xsd:base64Binary"/>
         <xs:enumeration value="xsd:anyURI"/>
         <xs:enumeration value="xsd:normalizedString"/>
         <xs:enumeration value="xsd:token"/>
         <xs:enumeration value="xsd:integer"/>
         <xs:enumeration value="xsd:nonPositiveInteger"/>
         <xs:enumeration value="xsd:negativeInteger"/>
         <xs:enumeration value="xsd:long"/>
         <xs:enumeration value="xsd:int"/>
         <xs:enumeration value="xsd:short"/>
         <xs:enumeration value="xsd:byte"/>
         <xs:enumeration value="xsd:nonNegativeInteger"/>
         <xs:enumeration value="xsd:unsignedLong"/>
         <xs:enumeration value="xsd:unsignedInt"/>
         <xs:enumeration value="xsd:unsignedShort"/>
         <xs:enumeration value="xsd:unsignedByte"/>
         <xs:enumeration value="xsd:positiveInteger"/>
      </xs:restriction>
   </xs:simpleType>
   <!--Uri-->
   <xs:complexType name="Uri">
      <xs:annotation>
         <xs:documentation> A uniform resource identifier. In general, this is expected to be an URL (for example, to
            link to an image on a website, in which case the 'type' attribute might be 'image' and 'desc' might be
            'image of a California sea hare'). </xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:anyURI">
            <xs:attribute name="desc" type="xs:token"/>
            <xs:attribute name="type" type="xs:token"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <!-- Confidence:-->
   <xs:complexType name="Confidence">
      <xs:annotation>
         <xs:documentation> A general purpose confidence element. For example this can be used to express the bootstrap
            support value of a clade (in which case the 'type' attribute is 'bootstrap').</xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:double">
            <xs:attribute name="type" type="xs:token" use="required"/>
            <xs:attribute name="stddev" type="xs:double"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <!-- Identifier:-->
   <xs:complexType name="Id">
      <xs:annotation>
         <xs:documentation> A general purpose identifier element. Allows to indicate the provider (or authority) of an
            identifier. </xs:documentation>
      </xs:annotation>
      <xs:simpleContent>
         <xs:extension base="xs:token">
            <xs:attribute name="provider" type="xs:token"/>
         </xs:extension>
      </xs:simpleContent>
   </xs:complexType>
   <!-- Distribution:-->
   <xs:complexType name="Distribution">
      <xs:annotation>
         <xs:documentation> The geographic distribution of the items of a clade (species, sequences), intended for
            phylogeographic applications. The location can be described either by free text in the 'desc' element and/or
            by the coordinates of one or more 'Points' (similar to the 'Point' element in Google's KML format) or by
            'Polygons'. </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="desc" type="xs:token" minOccurs="0"/>
         <xs:element name="point" type="phy:Point" minOccurs="0" maxOccurs="unbounded"/>
         <xs:element name="polygon" type="phy:Polygon" minOccurs="0" maxOccurs="unbounded"/>
      </xs:sequence>
   </xs:complexType>
   <xs:complexType name="Point">
      <xs:annotation>
         <xs:documentation> The coordinates of a point with an optional altitude (used by element 'Distribution').
            Required attributes are the 'geodetic_datum' used to indicate the geodetic datum (also called 'map datum',
            for example Google's KML uses 'WGS84'). Attribute 'alt_unit' is the unit for the altitude (e.g. 'meter').
         </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="lat" type="xs:decimal"/>
         <xs:element name="long" type="xs:decimal"/>
         <xs:element name="alt" type="xs:decimal" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="geodetic_datum" type="xs:token" use="required"/>
      <xs:attribute name="alt_unit" type="xs:token"/>
   </xs:complexType>
   <xs:complexType name="Polygon">
      <xs:annotation>
         <xs:documentation> A polygon defined by a list of 'Points' (used by element 'Distribution').
         </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="point" type="phy:Point" minOccurs="3" maxOccurs="unbounded"/>
      </xs:sequence>
   </xs:complexType>
   <!-- Date:-->
   <xs:complexType name="Date">
      <xs:annotation>
         <xs:documentation> A date associated with a clade/node. Its value can be numerical by using the 'value' element
            and/or free text with the 'desc' element' (e.g. 'Silurian'). If a numerical value is used, it is recommended
            to employ the 'unit' attribute to indicate the type of the numerical value (e.g. 'mya' for 'million years
            ago'). The elements 'minimum' and 'maximum' are used the indicate a range/confidence
         interval</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="desc" type="xs:token" minOccurs="0"/>
         <xs:element name="value" type="xs:decimal" minOccurs="0"/>
         <xs:element name="minimum" type="xs:decimal" minOccurs="0"/>
         <xs:element name="maximum" type="xs:decimal" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="unit" type="xs:token"/>
   </xs:complexType>
   <!-- BranchColor:-->
   <xs:complexType name="BranchColor">
      <xs:annotation>
         <xs:documentation> This indicates the color of a clade when rendered (the color applies to the whole clade
            unless overwritten by the color(s) of sub clades).</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="red" type="xs:unsignedByte"/>
         <xs:element name="green" type="xs:unsignedByte"/>
         <xs:element name="blue" type="xs:unsignedByte"/>
      </xs:sequence>
   </xs:complexType>
   <!-- SequenceRelation:-->
   <xs:complexType name="SequenceRelation">
      <xs:annotation>
         <xs:documentation> This is used to express a typed relationship between two sequences. For example it could be
            used to describe an orthology (in which case attribute 'type' is 'orthology'). </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="id_ref_0" type="phy:id_ref" use="required"/>
      <xs:attribute name="id_ref_1" type="phy:id_ref" use="required"/>
      <xs:attribute name="distance" type="xs:double"/>
      <xs:attribute name="type" type="phy:SequenceRelationType" use="required"/>
   </xs:complexType>
   <xs:simpleType name="SequenceRelationType">
      <xs:restriction base="xs:token">
         <xs:enumeration value="orthology"/>
         <xs:enumeration value="one_to_one_orthology"/>
         <xs:enumeration value="super_orthology"/>
         <xs:enumeration value="paralogy"/>
         <xs:enumeration value="ultra_paralogy"/>
         <xs:enumeration value="xenology"/>
         <xs:enumeration value="unknown"/>
         <xs:enumeration value="other"/>
      </xs:restriction>
   </xs:simpleType>
   <!-- CladeRelation:-->
   <xs:complexType name="CladeRelation">
      <xs:annotation>
         <xs:documentation> This is used to express a typed relationship between two clades. For example it could be
            used to describe multiple parents of a clade.</xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="confidence" type="phy:Confidence" minOccurs="0"/>
      </xs:sequence>
      <xs:attribute name="id_ref_0" type="phy:id_ref" use="required"/>
      <xs:attribute name="id_ref_1" type="phy:id_ref" use="required"/>
      <xs:attribute name="distance" type="xs:double"/>
      <xs:attribute name="type" type="xs:token" use="required"/>
   </xs:complexType>
   <!-- Used to link elements together on the xml level:-->
   <xs:simpleType name="id_source">
      <xs:restriction base="xs:ID"/>
   </xs:simpleType>
   <xs:simpleType name="id_ref">
      <xs:restriction base="xs:IDREF"/>
   </xs:simpleType>
</xs:schema>
