How to access properties file values in blueprint outside camel context from outside server location ?

Issue

• We have a requirement to access values from a property file to be used in our blue print.
  These values should be used outside camel-context () and the property file should be out side the server file system

• We are getting the below while we are using the Bluepint ext namespace, http://aries.apache.org/modules/blueprintnoosgi.html.

Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'location'. One of '{"http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0":default-properties, "http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0":location}'; is expected.

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
 xmlns:ext="http://aries.apache.org/blueprint/xmlns/blueprint-ext/v1.0.0"
  xmlns:enc="http://karaf.apache.org/xmlns/jasypt/v1.0.0">
   <ext:property-placeholder>
    <location>file:etc/ldap.properties</location>
   </ext:property-placeholder>
</blueprint>

• Which is the dependency that includes this schema from which the sub-elements can be fetched, used and validated ? We are not able to find it ?

• We are also getting the below error,

org.osgi.service.blueprint.container.ComponentDefinitionException: Multiple placeholders with the same prefix and suffix are not allowed
    at org.apache.aries.blueprint.ext.PlaceholdersUtils.validatePlaceholder(PlaceholdersUtils.java:49)[9:org.apache.aries.blueprint.core:1.0.1.redhat-610379]