XSD to constrain XML element values to existing XML attribute values? -

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the goal constrain best_friend_id have value of existing friend_id attribute in xml:

friends.xml

<?xml version="1.0"?> <friends xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"        xsi:nonamespaceschemalocation="friends.xsd">     <friend friend_id="1">         <name>john</name>         <best_friend_id>2</best_friend_id>     </friend>     <friend friend_id="2">         <name>kate</name>         <best_friend_id>1</best_friend_id>     </friend> </friends>

e.g. given xml, validation should fail if change value of best_friend_idelement 3.

friends.xsd

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema" elementformdefault="qualified"     xmlns:vc="http://www.w3.org/2007/xmlschema-versioning">     <xs:complextype name="friendstype">         <xs:sequence>             <xs:element ref="friend" maxoccurs="unbounded"/>         </xs:sequence>     </xs:complextype>     <xs:complextype name="friendtype">         <xs:sequence>             <xs:element ref="name"/>             <xs:element ref="best_friend_id"/>         </xs:sequence>         <xs:attribute name="friend_id" type="xs:integer"/>     </xs:complextype>      <xs:element name="friends" type="friendstype"/>     <xs:element name="friend" type="friendtype"/>     <xs:element name="name" type="xs:string"/>     <xs:element name="best_friend_id" type="xs:integer"/> </xs:schema>

my idea use power of asserts (xsd 1.1). i've figured out far

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema" elementformdefault="qualified"     xmlns:vc="http://www.w3.org/2007/xmlschema-versioning" vc:minversion="1.1">     <xs:complextype name="friendstype">         <xs:sequence>             <xs:element ref="friend" maxoccurs="unbounded"/>         </xs:sequence>     </xs:complextype>     <xs:complextype name="friendtype">         <xs:sequence>             <xs:element ref="name"/>             <xs:element ref="best_friend_id"/>         </xs:sequence>         <xs:attribute name="friend_id" type="xs:integer"/>     </xs:complextype>     <xs:complextype name="idconstrain">         <xs:simplecontent>             <xs:extension base="xs:integer">                 <xs:assert test="$value = @friend_id"/>             </xs:extension>         </xs:simplecontent>     </xs:complextype>      <xs:element name="friends" type="friendstype"/>     <xs:element name="friend" type="friendtype"/>     <xs:element name="name" type="xs:string"/>     <xs:element name="best_friend_id" type="idconstrain"/> </xs:schema>

and validation fails:

severity: error description: cvc-assertion: assertion evaluation ('$value = @friend_id') element 'best_friend_id' on schema type 'idconstrain' did not succeed. start location: 6:10 end location: 6:25 url: http://www.w3.org/tr/xmlschema11-1/#cvc-assertion

i have tried best_friend_id[contains(., @friend_id)] not work well.

you should use following check every best friend id existing friend id. should check bestfriend id not equal itself:

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema"      elementformdefault="qualified"     xmlns:vc="http://www.w3.org/2007/xmlschema-versioning"     vc:minversion="1.1">      <xs:complextype name="friendstype">         <xs:sequence>             <xs:element ref="friend" maxoccurs="unbounded"/>         </xs:sequence>         <xs:assert test="every $bfid in friend/best_friend_id             satisfies $bfid = (friend/@friend_id)"/>         <!-- optional check best friend not equals -->         <xs:assert test="every $fr in friend             satisfies $fr/@friend_id != $fr/best_friend_id"/>     </xs:complextype>      <xs:complextype name="friendtype">         <xs:sequence>             <xs:element ref="name"/>             <xs:element ref="best_friend_id"/>         </xs:sequence>         <xs:attribute name="friend_id" type="xs:integer"/>     </xs:complextype>      <xs:element name="friends" type="friendstype"/>     <xs:element name="friend" type="friendtype"/>     <xs:element name="name" type="xs:string"/>     <xs:element name="best_friend_id" type="xs:integer"/> </xs:schema>

you check bestfriend id diferent friend id inside friend tag instead of friends tag.

<xs:complextype name="friendtype">     <xs:sequence>         <xs:element ref="name"/>         <xs:element ref="best_friend_id"/>     </xs:sequence>     <xs:attribute name="friend_id" type="xs:integer"/>     <xs:assert test="@friend_id != best_friend_id"/> </xs:complextype>

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