How to associate a workflow to a custom contentType

If you want to attach your custom workflow to a content type (single, multiple or all of the content types.. below are samples..

Associate workflow with a single contentType
Notice the highlighted portion which is a ';' delimited two part entry.
First is the type of category and second is the id of the entity. In this example, the category is content type and I have specified the id of the content type that should be available for this workflow.

<?xml version="1.0" encoding="utf-8" ?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <Workflow
     Name="WFName"
     Description="This workflow will .."
     Id="532c0a2d-fa10-4dad-80a4-1069b2bd8e27"
     CodeBesideClass="Demo.Workflow.Workflow1"
     CodeBesideAssembly="$assemblyname$"
      InstantiationUrl="_LAYOUTS/DEMO/DemoForms/form0_Init.aspx">
    <Categories/>
    <MetaData>
      <AssociationCategories>ContentType;0x010100a945f312c7bd4a589d1489ca8307f24d</AssociationCategories>
      <StatusPageUrl>_layouts/WrkStat.aspx</StatusPageUrl>
    </MetaData>
  </Workflow>
</Elements>

Associate workflow with a multiple contentType
notice that every set of category is seperated by the delimiter ';#'

<MetaData>
  <AssociationCategories>ContentType;0x010100a945f312c7bd4a589d1489ca8307f24d;#ContentType;0x0101009a30bd7a9c18447e9b806af9c0931b9c</AssociationCategories>
</MetaData>

Associate workflow with a all contentTypes

<MetaData>
  <AssociationCategories>ContentType</AssociationCategories>
</MetaData>

Associate workflow with a all contentTypes and Lists

<MetaData>
  <AssociationCategories>ContentType;#List</AssociationCategories>
</MetaData>