XSD - Validate attribute value based on attribute value in parent element

Is it possible to define an XSD structure such that and attribute on an element can have a certain value only if an attribute on a parent (direct/indirect) element has a certain value?

Example:

<root>
    <child1 myAttr="true">
        <child2>
            <child3 otherAttr="false" /> <!-- 'otherAttr' can only be 'false' if 'myAttr' is 'true' -->
        </child2>
    </child1>
</root>

Pseudo Solution:

To add something like <rule condition="@otherAttr == true && //child1/@myAttr != false" /> to the definition of the 'child3' complex type...

Example:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema elementFormDefault="qualified" 
       xmlns:xs="http://ift.tt/tphNwY" 
       xmlns="http://ift.tt/141Y6VZ" 
       targetNamespace="http://ift.tt/141Y6VZ">

<xs:element name="root">
  <xs:sequence>
      <xs:element name="child1" type="child1Type" />
  </xs:sequence>
</xs:element>

<xs:complexType name="child1Type">
  <xs:sequence>
    <xs:element name="child2" type="child2Type" />
  </xs:sequence>
  <xs:attribute name="myAttr" type="xs:boolean" use="optional" default="false" />
</xs:complexType>

<xs:complexType name="child2Type">
  <xs:sequence>
    <xs:element name="child3" type="child3Type" />
  </xs:sequence>
</xs:complexType>

<xs:complexType name="child3Type">
  <xs:attribute name="otherAttr" type="xs:boolean" use="optional" default="true" /> 
  <rule condition="@otherAttr == true && //child1/@myAttr != false" />
</xs:complexType>